diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..a6be739
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+end_of_line = lf
+
+[*.md]
+indent_style = space
+indent_size = 4
+max_line_length = off
+trim_trailing_whitespace = false
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..176a458
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto
diff --git a/.gitea/workflows/on-push.yaml b/.gitea/workflows/on-push.yaml
index cb616ba..47e8439 100644
--- a/.gitea/workflows/on-push.yaml
+++ b/.gitea/workflows/on-push.yaml
@@ -5,6 +5,17 @@ jobs:
   build-and-test:
     runs-on: linux
     container: code.helloryan.se/infra/buildenv/cxx-amd64-fedora-40:latest
+    volumes:
+      - /build
     steps:
-      - name: Check out repository code
-        uses: actions/checkout@v4
+      - name: Login (.netrc)
+        run: |
+          echo machine code.helloryan.se >> ~/.netrc
+          echo login $GITHUB_ACTOR >> ~/.netrc
+          echo password ${{ secrets.GITEA_TOKEN}} >> ~/.netrc
+      - name: Initialize (bpkg)
+        run: bpkg create -d /build cc config.cxx=g++ config.cc.coptions="-Wall -Werror"
+      - name: Build (bpkg)
+        run: cd /build && bpkg build --yes $GITHUB_SERVER_URL/$GITHUB_REPOSITORY.git##$GITHUB_SHA
+      - name: Test (bpkg)
+        run: cd /build && bpkg test libarc-validate
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8c19e5f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,32 @@
+.bdep/
+Doxyfile
+
+# Local default options files.
+#
+.build2/local/
+
+# Compiler/linker output.
+#
+*.d
+*.t
+*.i
+*.i.*
+*.ii
+*.ii.*
+*.o
+*.obj
+*.gcm
+*.pcm
+*.ifc
+*.so
+*.dylib
+*.dll
+*.a
+*.lib
+*.exp
+*.pdb
+*.ilk
+*.exe
+*.exe.dlls/
+*.exe.manifest
+*.pc
diff --git a/Doxyfile.in b/Doxyfile.in
new file mode 100644
index 0000000..b721169
--- /dev/null
+++ b/Doxyfile.in
@@ -0,0 +1,404 @@
+# Doxyfile 1.10.0
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
+DOXYFILE_ENCODING      = UTF-8
+PROJECT_NAME           = "@project@"
+PROJECT_NUMBER         = "@version@"
+PROJECT_BRIEF          = "@SUMMARY@"
+PROJECT_LOGO           =
+PROJECT_ICON           =
+OUTPUT_DIRECTORY       = @out_root@/docs/api-reference
+CREATE_SUBDIRS         = YES
+CREATE_SUBDIRS_LEVEL   = 8
+ALLOW_UNICODE_NAMES    = NO
+OUTPUT_LANGUAGE        = English
+BRIEF_MEMBER_DESC      = YES
+REPEAT_BRIEF           = YES
+ABBREVIATE_BRIEF       =
+ALWAYS_DETAILED_SEC    = YES
+INLINE_INHERITED_MEMB  = NO
+FULL_PATH_NAMES        = YES
+STRIP_FROM_PATH        = "@src_root@"
+STRIP_FROM_INC_PATH    = "@src_root@"
+SHORT_NAMES            = NO
+JAVADOC_AUTOBRIEF      = YES
+JAVADOC_BANNER         = NO
+QT_AUTOBRIEF           = NO
+MULTILINE_CPP_IS_BRIEF = NO
+PYTHON_DOCSTRING       = YES
+INHERIT_DOCS           = YES
+SEPARATE_MEMBER_PAGES  = NO
+TAB_SIZE               = 4
+ALIASES                =
+OPTIMIZE_OUTPUT_FOR_C  = NO
+OPTIMIZE_OUTPUT_JAVA   = NO
+OPTIMIZE_FOR_FORTRAN   = NO
+OPTIMIZE_OUTPUT_VHDL   = NO
+OPTIMIZE_OUTPUT_SLICE  = NO
+EXTENSION_MAPPING      =
+MARKDOWN_SUPPORT       = YES
+TOC_INCLUDE_HEADINGS   = 5
+MARKDOWN_ID_STYLE      = DOXYGEN
+AUTOLINK_SUPPORT       = NO
+BUILTIN_STL_SUPPORT    = YES
+CPP_CLI_SUPPORT        = NO
+SIP_SUPPORT            = NO
+IDL_PROPERTY_SUPPORT   = YES
+DISTRIBUTE_GROUP_DOC   = NO
+GROUP_NESTED_COMPOUNDS = NO
+SUBGROUPING            = YES
+INLINE_GROUPED_CLASSES = NO
+INLINE_SIMPLE_STRUCTS  = NO
+TYPEDEF_HIDES_STRUCT   = NO
+LOOKUP_CACHE_SIZE      = 0
+NUM_PROC_THREADS       = 1
+TIMESTAMP              = NO
+#---------------------------------------------------------------------------
+# Build related configuration options
+#---------------------------------------------------------------------------
+EXTRACT_ALL            = NO
+EXTRACT_PRIVATE        = NO
+EXTRACT_PRIV_VIRTUAL   = NO
+EXTRACT_PACKAGE        = NO
+EXTRACT_STATIC         = NO
+EXTRACT_LOCAL_CLASSES  = NO
+EXTRACT_LOCAL_METHODS  = NO
+EXTRACT_ANON_NSPACES   = YES
+RESOLVE_UNNAMED_PARAMS = YES
+HIDE_UNDOC_MEMBERS     = NO
+HIDE_UNDOC_CLASSES     = NO
+HIDE_FRIEND_COMPOUNDS  = NO
+HIDE_IN_BODY_DOCS      = NO
+INTERNAL_DOCS          = NO
+CASE_SENSE_NAMES       = SYSTEM
+HIDE_SCOPE_NAMES       = NO
+HIDE_COMPOUND_REFERENCE= NO
+SHOW_HEADERFILE        = YES
+SHOW_INCLUDE_FILES     = YES
+SHOW_GROUPED_MEMB_INC  = NO
+FORCE_LOCAL_INCLUDES   = NO
+INLINE_INFO            = YES
+SORT_MEMBER_DOCS       = YES
+SORT_BRIEF_DOCS        = NO
+SORT_MEMBERS_CTORS_1ST = NO
+SORT_GROUP_NAMES       = NO
+SORT_BY_SCOPE_NAME     = NO
+STRICT_PROTO_MATCHING  = NO
+GENERATE_TODOLIST      = YES
+GENERATE_TESTLIST      = YES
+GENERATE_BUGLIST       = YES
+GENERATE_DEPRECATEDLIST= YES
+ENABLED_SECTIONS       =
+MAX_INITIALIZER_LINES  = 30
+SHOW_USED_FILES        = YES
+SHOW_FILES             = YES
+SHOW_NAMESPACES        = YES
+FILE_VERSION_FILTER    =
+LAYOUT_FILE            =
+CITE_BIB_FILES         =
+#---------------------------------------------------------------------------
+# Configuration options related to warning and progress messages
+#---------------------------------------------------------------------------
+QUIET                  = NO
+WARNINGS               = YES
+WARN_IF_UNDOCUMENTED   = YES
+WARN_IF_DOC_ERROR      = YES
+WARN_IF_INCOMPLETE_DOC = YES
+WARN_NO_PARAMDOC       = NO
+WARN_IF_UNDOC_ENUM_VAL = NO
+WARN_AS_ERROR          = NO
+WARN_FORMAT            = "$file:$line: $text"
+WARN_LINE_FORMAT       = "at line $line of file $file"
+WARN_LOGFILE           =
+#---------------------------------------------------------------------------
+# Configuration options related to the input files
+#---------------------------------------------------------------------------
+INPUT                  = @src_root@/README.md \
+                         @src_root@/arc
+INPUT_ENCODING         = UTF-8
+INPUT_FILE_ENCODING    =
+FILE_PATTERNS          = *.c \
+                         *.cc \
+                         *.cxx \
+                         *.cxxm \
+                         *.cpp \
+                         *.cppm \
+                         *.ccm \
+                         *.c++ \
+                         *.c++m \
+                         *.java \
+                         *.ii \
+                         *.ixx \
+                         *.ipp \
+                         *.i++ \
+                         *.inl \
+                         *.idl \
+                         *.ddl \
+                         *.odl \
+                         *.h \
+                         *.hh \
+                         *.hxx \
+                         *.hpp \
+                         *.h++ \
+                         *.ixx \
+                         *.l \
+                         *.cs \
+                         *.d \
+                         *.php \
+                         *.php4 \
+                         *.php5 \
+                         *.phtml \
+                         *.inc \
+                         *.m \
+                         *.markdown \
+                         *.md \
+                         *.mm \
+                         *.dox \
+                         *.py \
+                         *.pyw \
+                         *.f90 \
+                         *.f95 \
+                         *.f03 \
+                         *.f08 \
+                         *.f18 \
+                         *.f \
+                         *.for \
+                         *.vhd \
+                         *.vhdl \
+                         *.ucf \
+                         *.qsf \
+                         *.txx \
+                         *.ice
+RECURSIVE              = YES
+EXCLUDE                =
+EXCLUDE_SYMLINKS       = NO
+EXCLUDE_PATTERNS       =
+EXCLUDE_SYMBOLS        =
+EXAMPLE_PATH           =
+EXAMPLE_PATTERNS       = *
+EXAMPLE_RECURSIVE      = NO
+IMAGE_PATH             =
+INPUT_FILTER           =
+FILTER_PATTERNS        =
+FILTER_SOURCE_FILES    = NO
+FILTER_SOURCE_PATTERNS =
+USE_MDFILE_AS_MAINPAGE = @src_root@/docs/introduction.md
+FORTRAN_COMMENT_AFTER  = 72
+#---------------------------------------------------------------------------
+# Configuration options related to source browsing
+#---------------------------------------------------------------------------
+SOURCE_BROWSER         = NO
+INLINE_SOURCES         = NO
+STRIP_CODE_COMMENTS    = YES
+REFERENCED_BY_RELATION = NO
+REFERENCES_RELATION    = NO
+REFERENCES_LINK_SOURCE = YES
+SOURCE_TOOLTIPS        = YES
+USE_HTAGS              = NO
+VERBATIM_HEADERS       = YES
+#---------------------------------------------------------------------------
+# Configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
+ALPHABETICAL_INDEX     = YES
+IGNORE_PREFIX          =
+#---------------------------------------------------------------------------
+# Configuration options related to the HTML output
+#---------------------------------------------------------------------------
+GENERATE_HTML          = YES
+HTML_OUTPUT            = html
+HTML_FILE_EXTENSION    = .html
+HTML_HEADER            =
+HTML_FOOTER            =
+HTML_STYLESHEET        =
+HTML_EXTRA_STYLESHEET  =
+HTML_EXTRA_FILES       =
+HTML_COLORSTYLE        = LIGHT
+#HTML_COLORSTYLE_HUE    = 327
+#HTML_COLORSTYLE_SAT    = 89
+#HTML_COLORSTYLE_GAMMA  = 65
+HTML_COLORSTYLE_HUE    = 204
+HTML_COLORSTYLE_SAT    = 60
+HTML_COLORSTYLE_GAMMA  = 100
+HTML_DYNAMIC_MENUS     = YES
+HTML_DYNAMIC_SECTIONS  = NO
+HTML_CODE_FOLDING      = YES
+HTML_COPY_CLIPBOARD    = YES
+HTML_PROJECT_COOKIE    =
+HTML_INDEX_NUM_ENTRIES = 100
+GENERATE_DOCSET        = NO
+DOCSET_FEEDNAME        = "Doxygen generated docs"
+DOCSET_FEEDURL         =
+DOCSET_BUNDLE_ID       = org.doxygen.Project
+DOCSET_PUBLISHER_ID    = org.doxygen.Publisher
+DOCSET_PUBLISHER_NAME  = Publisher
+GENERATE_HTMLHELP      = NO
+CHM_FILE               =
+HHC_LOCATION           =
+GENERATE_CHI           = NO
+CHM_INDEX_ENCODING     =
+BINARY_TOC             = NO
+TOC_EXPAND             = NO
+SITEMAP_URL            =
+GENERATE_QHP           = NO
+QCH_FILE               =
+QHP_NAMESPACE          = org.doxygen.Project
+QHP_VIRTUAL_FOLDER     = doc
+QHP_CUST_FILTER_NAME   =
+QHP_CUST_FILTER_ATTRS  =
+QHP_SECT_FILTER_ATTRS  =
+QHG_LOCATION           =
+GENERATE_ECLIPSEHELP   = NO
+ECLIPSE_DOC_ID         = org.doxygen.Project
+DISABLE_INDEX          = NO
+GENERATE_TREEVIEW      = NO
+FULL_SIDEBAR           = NO
+ENUM_VALUES_PER_LINE   = 4
+TREEVIEW_WIDTH         = 250
+EXT_LINKS_IN_WINDOW    = NO
+OBFUSCATE_EMAILS       = NO
+HTML_FORMULA_FORMAT    = png
+FORMULA_FONTSIZE       = 10
+FORMULA_MACROFILE      =
+USE_MATHJAX            = NO
+MATHJAX_VERSION        = MathJax_2
+MATHJAX_FORMAT         = HTML-CSS
+MATHJAX_RELPATH        =
+MATHJAX_EXTENSIONS     =
+MATHJAX_CODEFILE       =
+SEARCHENGINE           = YES
+SERVER_BASED_SEARCH    = NO
+EXTERNAL_SEARCH        = NO
+SEARCHENGINE_URL       =
+SEARCHDATA_FILE        = searchdata.xml
+EXTERNAL_SEARCH_ID     =
+EXTRA_SEARCH_MAPPINGS  =
+#---------------------------------------------------------------------------
+# Configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
+GENERATE_LATEX         = NO
+LATEX_OUTPUT           = latex
+LATEX_CMD_NAME         =
+MAKEINDEX_CMD_NAME     = makeindex
+LATEX_MAKEINDEX_CMD    = makeindex
+COMPACT_LATEX          = NO
+PAPER_TYPE             = a4
+EXTRA_PACKAGES         =
+LATEX_HEADER           =
+LATEX_FOOTER           =
+LATEX_EXTRA_STYLESHEET =
+LATEX_EXTRA_FILES      =
+PDF_HYPERLINKS         = YES
+USE_PDFLATEX           = YES
+LATEX_BATCHMODE        = NO
+LATEX_HIDE_INDICES     = NO
+LATEX_BIB_STYLE        = plain
+LATEX_EMOJI_DIRECTORY  =
+#---------------------------------------------------------------------------
+# Configuration options related to the RTF output
+#---------------------------------------------------------------------------
+GENERATE_RTF           = NO
+RTF_OUTPUT             = rtf
+COMPACT_RTF            = NO
+RTF_HYPERLINKS         = NO
+RTF_STYLESHEET_FILE    =
+RTF_EXTENSIONS_FILE    =
+#---------------------------------------------------------------------------
+# Configuration options related to the man page output
+#---------------------------------------------------------------------------
+GENERATE_MAN           = NO
+MAN_OUTPUT             = man
+MAN_EXTENSION          = .3
+MAN_SUBDIR             =
+MAN_LINKS              = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the XML output
+#---------------------------------------------------------------------------
+GENERATE_XML           = NO
+XML_OUTPUT             = xml
+XML_PROGRAMLISTING     = YES
+XML_NS_MEMB_FILE_SCOPE = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the DOCBOOK output
+#---------------------------------------------------------------------------
+GENERATE_DOCBOOK       = NO
+DOCBOOK_OUTPUT         = docbook
+#---------------------------------------------------------------------------
+# Configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
+GENERATE_AUTOGEN_DEF   = NO
+#---------------------------------------------------------------------------
+# Configuration options related to Sqlite3 output
+#---------------------------------------------------------------------------
+GENERATE_SQLITE3       = NO
+SQLITE3_OUTPUT         = sqlite3
+SQLITE3_RECREATE_DB    = YES
+#---------------------------------------------------------------------------
+# Configuration options related to the Perl module output
+#---------------------------------------------------------------------------
+GENERATE_PERLMOD       = NO
+PERLMOD_LATEX          = NO
+PERLMOD_PRETTY         = YES
+PERLMOD_MAKEVAR_PREFIX =
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor
+#---------------------------------------------------------------------------
+ENABLE_PREPROCESSING   = YES
+MACRO_EXPANSION        = NO
+EXPAND_ONLY_PREDEF     = NO
+SEARCH_INCLUDES        = YES
+INCLUDE_PATH           = "@src_root@"
+INCLUDE_FILE_PATTERNS  =
+PREDEFINED             = LIBARC_VALIDATE_SYMEXPORT
+EXPAND_AS_DEFINED      =
+SKIP_FUNCTION_MACROS   = YES
+#---------------------------------------------------------------------------
+# Configuration options related to external references
+#---------------------------------------------------------------------------
+TAGFILES               =
+GENERATE_TAGFILE       =
+ALLEXTERNALS           = NO
+EXTERNAL_GROUPS        = YES
+EXTERNAL_PAGES         = YES
+#---------------------------------------------------------------------------
+# Configuration options related to diagram generator tools
+#---------------------------------------------------------------------------
+HIDE_UNDOC_RELATIONS   = YES
+HAVE_DOT               = YES
+DOT_NUM_THREADS        = 0
+DOT_COMMON_ATTR        = "fontname=Helvetica,fontsize=10"
+DOT_EDGE_ATTR          = "labelfontname=Helvetica,labelfontsize=10"
+DOT_NODE_ATTR          = "shape=box,height=0.2,width=0.4"
+DOT_FONTPATH           =
+CLASS_GRAPH            = YES
+COLLABORATION_GRAPH    = YES
+GROUP_GRAPHS           = YES
+UML_LOOK               = NO
+UML_LIMIT_NUM_FIELDS   = 10
+DOT_UML_DETAILS        = NO
+DOT_WRAP_THRESHOLD     = 17
+TEMPLATE_RELATIONS     = NO
+INCLUDE_GRAPH          = YES
+INCLUDED_BY_GRAPH      = YES
+CALL_GRAPH             = NO
+CALLER_GRAPH           = NO
+GRAPHICAL_HIERARCHY    = YES
+DIRECTORY_GRAPH        = YES
+DIR_GRAPH_MAX_DEPTH    = 1
+DOT_IMAGE_FORMAT       = png
+INTERACTIVE_SVG        = NO
+DOT_PATH               =
+DOTFILE_DIRS           =
+DIA_PATH               =
+DIAFILE_DIRS           =
+PLANTUML_JAR_PATH      =
+PLANTUML_CFG_FILE      =
+PLANTUML_INCLUDE_PATH  =
+DOT_GRAPH_MAX_NODES    = 50
+MAX_DOT_GRAPH_DEPTH    = 0
+DOT_MULTI_TARGETS      = NO
+GENERATE_LEGEND        = YES
+DOT_CLEANUP            = YES
+MSCGEN_TOOL            =
+MSCFILE_DIRS           =
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f42eda8
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+Arc Project Software License, version 1.0, June 2nd 2024
+
+Permission to use, copy, modify, distribute, and sell this software
+(the "Software") and its documentation for any purpose is hereby
+granted without fee, provided that the copyright notices in the
+Software and this license appear in supporting documentation.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGMENT,
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONJUNCTION WITH THE
+SOFTWARE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name(s) of copyright holders
+of the Software shall not be used in advertising or otherwise to
+promote the sale, use or other dealing in this Software without prior
+written authorization from the copyright holders.
diff --git a/arc/validate/.gitignore b/arc/validate/.gitignore
new file mode 100644
index 0000000..b1ed0e0
--- /dev/null
+++ b/arc/validate/.gitignore
@@ -0,0 +1,9 @@
+# Generated version header.
+#
+version.hxx
+
+# Unit test executables and Testscript output directories
+# (can be symlinks).
+#
+*.test
+test-*.test
diff --git a/arc/validate/buildfile b/arc/validate/buildfile
new file mode 100644
index 0000000..3eec8ab
--- /dev/null
+++ b/arc/validate/buildfile
@@ -0,0 +1,65 @@
+intf_libs = # Interface dependencies.
+impl_libs = # Implementation dependencies.
+
+./: lib{arc-validate}: libul{arc-validate}
+
+libul{arc-validate}: {hxx ixx txx cxx}{** -**.test... -version} \
+                {hxx            }{                version}
+
+libul{arc-validate}: $impl_libs $intf_libs
+
+# Unit tests.
+#
+exe{*.test}:
+{
+  test = true
+  install = false
+}
+
+for t: cxx{**.test...}
+{
+  d = $directory($t)
+  n = $name($t)...
+
+  ./: $d/exe{$n}: $t $d/{hxx ixx txx}{+$n} $d/testscript{+$n}
+  $d/exe{$n}: libul{arc-validate}: bin.whole = false
+}
+
+hxx{version}: in{version} $src_root/manifest
+
+# Build options.
+#
+cxx.poptions =+ "-I$out_root" "-I$src_root"
+cxx.coptions =+ -fvisibility=hidden
+
+obja{*}: cxx.poptions += -DLIBARC_VALIDATE_STATIC_BUILD
+objs{*}: cxx.poptions += -DLIBARC_VALIDATE_SHARED_BUILD
+
+# Export options.
+#
+lib{arc-validate}:
+{
+  cxx.export.poptions = "-I$out_root" "-I$src_root"
+  cxx.export.libs = $intf_libs
+}
+
+liba{arc-validate}: cxx.export.poptions += -DLIBARC_VALIDATE_STATIC
+libs{arc-validate}: cxx.export.poptions += -DLIBARC_VALIDATE_SHARED
+
+# For pre-releases use the complete version to make sure they cannot
+# be used in place of another pre-release or the final version. See
+# the version module for details on the version.* variable values.
+#
+if $version.pre_release
+  lib{arc-validate}: bin.lib.version = "-$version.project_id"
+else
+  lib{arc-validate}: bin.lib.version = "-$version.major.$version.minor"
+
+# Install into the arc/validate/ subdirectory of, say, /usr/include/
+# recreating subdirectories.
+#
+{hxx ixx txx}{*}:
+{
+  install         = include/arc/validate/
+  install.subdirs = true
+}
diff --git a/arc/validate/export.hxx b/arc/validate/export.hxx
new file mode 100644
index 0000000..829cff4
--- /dev/null
+++ b/arc/validate/export.hxx
@@ -0,0 +1,32 @@
+#ifndef arc__validate__export_hxx_
+#define arc__validate__export_hxx_
+
+#if defined _WIN32 || defined __CYGWIN__
+#  define LIBARC_VALIDATE_SO_IMPORT __declspec(dllimport)
+#  define LIBARC_VALIDATE_SO_EXPORT __declspec(dllexport)
+#  define LIBARC_VALIDATE_SO_LOCAL
+#else
+#  if __GNUC__ >= 4
+#    define LIBARC_VALIDATE_SO_IMPORT __attribute__ ((visibility ("default")))
+#    define LIBARC_VALIDATE_SO_EXPORT __attribute__ ((visibility ("default")))
+#    define LIBARC_VALIDATE_SO_LOCAL  __attribute__ ((visibility ("hidden")))
+#  else
+#    define LIBARC_VALIDATE_SO_IMPORT
+#    define LIBARC_VALIDATE_SO_EXPORT
+#    define LIBARC_VALIDATE_SO_LOCAL
+#  endif
+#endif
+
+#if defined(LIBARC_VALIDATE_STATIC)         // Using static.
+#  define LIBARC_VALIDATE_SYMEXPORT
+#elif defined(LIBARC_VALIDATE_STATIC_BUILD) // Building static.
+#  define LIBARC_VALIDATE_SYMEXPORT
+#elif defined(LIBARC_VALIDATE_SHARED)       // Using shared.
+#  define LIBARC_VALIDATE_SYMEXPORT LIBARC_VALIDATE_SO_IMPORT
+#elif defined(LIBARC_VALIDATE_SHARED_BUILD) // Building shared.
+#  define LIBARC_VALIDATE_SYMEXPORT LIBARC_VALIDATE_SO_EXPORT
+#else
+#  error define LIBARC_VALIDATE_STATIC or LIBARC_VALIDATE_SHARED
+#endif
+
+#endif
diff --git a/arc/validate/version.hxx.in b/arc/validate/version.hxx.in
new file mode 100644
index 0000000..d0ed044
--- /dev/null
+++ b/arc/validate/version.hxx.in
@@ -0,0 +1,37 @@
+#ifndef arc__validate__export_hxx_
+#define arc__validate__export_hxx_
+
+// The numeric version format is AAAAABBBBBCCCCCDDDE where:
+//
+// AAAAA - major version number
+// BBBBB - minor version number
+// CCCCC - bugfix version number
+// DDD   - alpha / beta (DDD + 500) version number
+// E     - final (0) / snapshot (1)
+//
+// When DDDE is not 0, 1 is subtracted from AAAAABBBBBCCCCC. For example:
+//
+// Version      AAAAABBBBBCCCCCDDDE
+//
+// 0.1.0        0000000001000000000
+// 0.1.2        0000000001000020000
+// 1.2.3        0000100002000030000
+// 2.2.0-a.1    0000200001999990010
+// 3.0.0-b.2    0000299999999995020
+// 2.2.0-a.1.z  0000200001999990011
+//
+#define LIBARC_VALIDATE_VERSION       $libarc_validate.version.project_number$ULL
+#define LIBARC_VALIDATE_VERSION_STR   "$libarc_validate.version.project$"
+#define LIBARC_VALIDATE_VERSION_ID    "$libarc_validate.version.project_id$"
+#define LIBARC_VALIDATE_VERSION_FULL  "$libarc_validate.version$"
+
+#define LIBARC_VALIDATE_VERSION_MAJOR $libarc_validate.version.major$
+#define LIBARC_VALIDATE_VERSION_MINOR $libarc_validate.version.minor$
+#define LIBARC_VALIDATE_VERSION_PATCH $libarc_validate.version.patch$
+
+#define LIBARC_VALIDATE_PRE_RELEASE   $libarc_validate.version.pre_release$
+
+#define LIBARC_VALIDATE_SNAPSHOT_SN   $libarc_validate.version.snapshot_sn$ULL
+#define LIBARC_VALIDATE_SNAPSHOT_ID   "$libarc_validate.version.snapshot_id$"
+
+#endif
diff --git a/build/.gitignore b/build/.gitignore
new file mode 100644
index 0000000..974e01d
--- /dev/null
+++ b/build/.gitignore
@@ -0,0 +1,4 @@
+/config.build
+/root/
+/bootstrap/
+build/
diff --git a/build/bootstrap.build b/build/bootstrap.build
new file mode 100644
index 0000000..e4fc73b
--- /dev/null
+++ b/build/bootstrap.build
@@ -0,0 +1,7 @@
+project = libarc-validate
+
+using version
+using config
+using test
+using install
+using dist
diff --git a/build/export.build b/build/export.build
new file mode 100644
index 0000000..345d646
--- /dev/null
+++ b/build/export.build
@@ -0,0 +1,6 @@
+$out_root/
+{
+  include arc/validate/
+}
+
+export $out_root/arc/validate/$import.target
diff --git a/build/root.build b/build/root.build
new file mode 100644
index 0000000..21e0a2e
--- /dev/null
+++ b/build/root.build
@@ -0,0 +1,16 @@
+# Uncomment to suppress warnings coming from external libraries.
+#
+#cxx.internal.scope = current
+
+cxx.std = latest
+
+using cxx
+
+hxx{*}: extension = hxx
+ixx{*}: extension = ixx
+txx{*}: extension = txx
+cxx{*}: extension = cxx
+
+# The test target for cross-testing (running tests under Wine, etc).
+#
+test.target = $cxx.target
diff --git a/buildfile b/buildfile
new file mode 100644
index 0000000..eb72f8f
--- /dev/null
+++ b/buildfile
@@ -0,0 +1,30 @@
+./: {arc/} doc{README.md} legal{LICENSE} manifest
+
+import? doxygen = doxygen%exe{doxygen}
+
+alias{all}: arc/
+
+if ($doxygen != [null])
+{
+  ./: file{Doxyfile}: in{Doxyfile} $src_root/manifest
+  {
+    in.symbol = '@'
+    in.mode = lax
+    backlink = copy
+
+    SUMMARY = $project.summary
+  }
+
+  alias{api-reference}: file{Doxyfile} $doxygen fsdir{docs/api-reference}
+  {{
+    i = $path($<[0])
+    diag doxygen $i
+    env --cwd $directory($i) -- $doxygen $leaf($i)
+  }}
+
+  alias{all}: alias{api-reference}
+}
+
+# Don't install tests.
+#
+tests/: install = false
diff --git a/docs/introduction.md b/docs/introduction.md
new file mode 100644
index 0000000..8905be9
--- /dev/null
+++ b/docs/introduction.md
@@ -0,0 +1,39 @@
+# Introduction
+
+[TOC]
+
+libarc-validate is a unit-testing library for C++.
+
+## Getting Started
+
+libarc-validate uses the [build2][build2] build system, which is also the
+only officially supported build system.
+
+### 1. repositories.manifest
+
+To get started, first add the libarc-validate repository to your
+`repositories.manifest` file:
+
+```
+:
+role: prerequisite
+location: https://code.helloryan.se/arc/libarc-validate.git##HEAD
+```
+
+### 2. manifest
+
+Then add `libarc-validate` as a dependency to your `manifest`-file:
+
+```
+depends: libarc-validate ^0.1.0-
+```
+
+### 3. buildfile
+
+Finally, import and link your binaries with `libarc-validate`:
+
+```
+import libs =+ libarc-validate%lib{arc-validate}
+```
+
+[build2]: https://build2.org/
diff --git a/manifest b/manifest
new file mode 100644
index 0000000..dedf56e
--- /dev/null
+++ b/manifest
@@ -0,0 +1,11 @@
+: 1
+name: libarc-validate
+version: 0.1.0-a.0.z
+language: c++
+summary: arc-validatae C++ library
+license: APSL-1.0 ; Arc Project Software License version 1.0
+description-file: README.md
+url: https://www.helloryan.se/arc-project/
+email: arc-project@helloryan.se
+depends: * build2 >= 0.17.0
+depends: * bpkg >= 0.17.0
diff --git a/repositories.manifest b/repositories.manifest
new file mode 100644
index 0000000..7136461
--- /dev/null
+++ b/repositories.manifest
@@ -0,0 +1,7 @@
+: 1
+summary: libarc-validate project repository
+
+:
+role: prerequisite
+location: https://pkg.cppget.org/1/beta
+trust: 70:64:FE:E4:E0:F3:60:F1:B4:51:E1:FA:12:5C:E0:B3:DB:DF:96:33:39:B9:2E:E5:C2:68:63:4C:A6:47:39:43
diff --git a/tests/.gitignore b/tests/.gitignore
new file mode 100644
index 0000000..662178d
--- /dev/null
+++ b/tests/.gitignore
@@ -0,0 +1,8 @@
+# Test executables.
+#
+driver
+
+# Testscript output directories (can be symlinks).
+#
+test
+test-*
diff --git a/tests/build/.gitignore b/tests/build/.gitignore
new file mode 100644
index 0000000..974e01d
--- /dev/null
+++ b/tests/build/.gitignore
@@ -0,0 +1,4 @@
+/config.build
+/root/
+/bootstrap/
+build/
diff --git a/tests/build/bootstrap.build b/tests/build/bootstrap.build
new file mode 100644
index 0000000..a07b5ea
--- /dev/null
+++ b/tests/build/bootstrap.build
@@ -0,0 +1,5 @@
+project = # Unnamed tests subproject.
+
+using config
+using test
+using dist
diff --git a/tests/build/root.build b/tests/build/root.build
new file mode 100644
index 0000000..a67b2fe
--- /dev/null
+++ b/tests/build/root.build
@@ -0,0 +1,16 @@
+cxx.std = latest
+
+using cxx
+
+hxx{*}: extension = hxx
+ixx{*}: extension = ixx
+txx{*}: extension = txx
+cxx{*}: extension = cxx
+
+# Every exe{} in this subproject is by default a test.
+#
+exe{*}: test = true
+
+# The test target for cross-testing (running tests under Wine, etc).
+#
+test.target = $cxx.target
diff --git a/tests/buildfile b/tests/buildfile
new file mode 100644
index 0000000..aeeab15
--- /dev/null
+++ b/tests/buildfile
@@ -0,0 +1 @@
+./: {*/ -build/}