diff --git a/devel/Makefile b/devel/Makefile
--- a/devel/Makefile
+++ b/devel/Makefile
@@ -166,6 +166,7 @@
     SUBDIR += R-cran-zeallot
     SUBDIR += RStudio
     SUBDIR += SpecTcl
+    SUBDIR += STC
     SUBDIR += aarch64-none-elf-gcc
     SUBDIR += abi-compliance-checker
     SUBDIR += abseil
diff --git a/devel/STC/Makefile b/devel/STC/Makefile
new file mode 100644
--- /dev/null
+++ b/devel/STC/Makefile
@@ -0,0 +1,28 @@
+PORTNAME=	STC
+DISTVERSIONPREFIX=	v
+DISTVERSION=	5.0
+CATEGORIES=	devel
+
+MAINTAINER=	alven@FreeBSD.org
+COMMENT=	Modern, user friendly, generic, type-safe and fast C99 container library
+WWW=		https://github.com/stclib/STC/
+
+LICENSE=	MIT
+LICENSE_FILE=	${WRKSRC}/LICENSE
+
+USES=		meson
+USE_GITHUB=	yes
+GH_ACCOUNT=	stclib
+USE_LDCONFIG=	yes
+
+OPTIONS_DEFINE=	DOCS EXAMPLES STATIC
+OPTIONS_SUB=	yes
+
+DOCS_MESON_ENABLED=	docs
+DOCS_MESON_ON=		-Ddocsdir=${DOCSDIR}
+EXAMPLES_MESON_ENABLED=	examples
+EXAMPLES_MESON_ON=	-Dexamplesdir=${EXAMPLESDIR}
+STATIC_MESON_ON=	-Ddefault_library=both
+STATIC_MESON_OFF=	-Ddefault_library=shared
+
+.include <bsd.port.mk>
diff --git a/devel/STC/distinfo b/devel/STC/distinfo
new file mode 100644
--- /dev/null
+++ b/devel/STC/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1736794242
+SHA256 (stclib-STC-v5.0_GH0.tar.gz) = d61353852b9d7ef69b56fa32edcbc7934f2153385f3778536234201ceebcc950
+SIZE (stclib-STC-v5.0_GH0.tar.gz) = 972147
diff --git a/devel/STC/files/patch-meson.build b/devel/STC/files/patch-meson.build
new file mode 100644
--- /dev/null
+++ b/devel/STC/files/patch-meson.build
@@ -0,0 +1,47 @@
+--- meson.build.orig	2025-01-12 20:41:47 UTC
++++ meson.build
+@@ -144,19 +144,33 @@ root = not meson.is_subproject()
+ endif
+ 
+ root = not meson.is_subproject()
+-subdir('tests')
+-subdir('examples')
+ 
+ if root
+-  datadir = get_option('datadir')
+-  docdir = get_option('docdir')
+-  if docdir == ''
+-    docdir = datadir / 'doc' / meson.project_name()
++  if get_option('docs').enabled()
++    docsdir = get_option('docsdir')
++
++    install_data('README.md', install_dir: docsdir)
++
++    install_subdir(
++      'docs',
++      install_dir: docsdir,
++      strip_directory: true
++    )
+   endif
+ 
+-  install_subdir(
+-    'docs',
+-    install_dir: docdir,
+-    strip_directory: true,
+-  )
++  if get_option('examples').enabled()
++    examplesdir = get_option('examplesdir')
++
++    subdir('examples')
++
++    install_subdir(
++      'examples',
++      install_dir: examplesdir,
++      strip_directory: true
++    )
++  endif
++
++  if get_option('tests').enabled()
++    subdir('tests')
++  endif
+ endif
diff --git a/devel/STC/files/patch-meson__options.txt b/devel/STC/files/patch-meson__options.txt
new file mode 100644
--- /dev/null
+++ b/devel/STC/files/patch-meson__options.txt
@@ -0,0 +1,29 @@
+--- meson_options.txt.orig	2025-01-14 15:37:45 UTC
++++ meson_options.txt
+@@ -5,10 +5,10 @@ option(
+   description: 'Build checkscoped tool for c_guard* blocks',
+ )
+ option(
+-  'tests',
++  'docs',
+   type: 'feature',
+   value: 'auto',
+-  description: 'Build tests and ctest',
++  description: 'Build documentation',
+ )
+ option(
+   'examples',
+@@ -16,5 +16,12 @@ option(
+   value: 'auto',
+   description: 'Build examples',
+ )
++option(
++  'tests',
++  type: 'feature',
++  value: 'auto',
++  description: 'Build tests and ctest',
++)
+ 
+-option('docdir', type: 'string', description: 'documentation directory')
++option('docsdir', type: 'string', description: 'documentation directory')
++option('examplesdir', type: 'string', description: 'examples directory')
diff --git a/devel/STC/pkg-descr b/devel/STC/pkg-descr
new file mode 100644
--- /dev/null
+++ b/devel/STC/pkg-descr
@@ -0,0 +1,54 @@
+STC is a comprehensive, modern, typesafe and fast templated general purpose
+container and algorithms library for C99. It aims to make C-programming even
+more fun, more productive and safer.
+
+* Reasons why you want to you use STC:
+
+C is still among the most popular programming languages, despite the fact that
+it was created as early as in 1972. That is a manifestation of how well the
+language was designed for its time, and still is. However, times are changing,
+and C is starting to lag behind many of the new upcoming system languages like
+Zig, Odin and Rust with regard to features in the standard library, but also
+when it comes to safety and vulnerabilities. STC aims to bridge some of that
+gap, to let us have common modern features and added safety, while we still can
+enjoy writing C.
+
+* Missing features in the C standard library, which STC provides:
+
+- A wide set of high performance, generic/templated typesafe container types,
+  including smart pointers and bitsets.
+- String type with utf8 support and short string optimization (sso), plus two
+  string-view types.
+- Typesafe and ergonomic sum type implementation, aka. tagged union or variant.
+- A coroutine implementation with excellent ergonomics, error recovery and
+  cleanup support.
+- Fast, modern regular expressions with full utf8 and a subset of unicode
+  character classes support.
+- Ranges algorithms like iota and filter views like take, skip, take-while,
+  skip-while, map.
+- Generic algorithms, iterators and loop abstactions. Blazing fast sort, binary
+  search and lower bound.
+- Single/multi-dimensional generic span view with arbitrary array dimensions
+  (numpy array-like slicing).
+
+* Improved safety by using STC:
+
+- Abstractions for raw loops, ranged iteration over containers, and generic
+  ranges algorithms. All this reduces the chance of creating bugs, as user code
+  with raw loops and ad-hoc implementation of common algorithms and containers
+  is minimized/eliminated.
+- STC is inherently type safe. Essentially, there are no opaque pointers or
+  casting away of type information. Only where neccesary, generic code will use
+  some macros to do compile-time type-checking before types are casted. Examples
+  are c_static_assert, c_const_cast, c_safe_cast and macros for safe integer
+  type casting.
+- Containers and algorithms all use signed integers for indices and sizes, and
+  it encourange to use signed integers for quantities in general (unsigned
+  integers have valid usages as bitsets and in bit operations). This could
+  remove a wide range of bugs related to mixed unsigned-signed calculations and
+  comparisons, which intuitively gives the wrong answer in many cases.
+- Tagged unions in C are common, but normally unsafely
+  implemented. Traditionally, it leaves the inactive payload data readily
+  accesible to user code, and there is no general way to ensure that the payload
+  is assigned along with the tag, or that they match. STC sum type is a typesafe
+  version of tagged unions which eliminates all those safety concerns.
diff --git a/devel/STC/pkg-plist b/devel/STC/pkg-plist
new file mode 100644
--- /dev/null
+++ b/devel/STC/pkg-plist
@@ -0,0 +1,183 @@
+include/c11/fmt.h
+include/stc/algorithm.h
+include/stc/arc.h
+include/stc/box.h
+include/stc/cbits.h
+include/stc/common.h
+include/stc/coption.h
+include/stc/coroutine.h
+include/stc/cregex.h
+include/stc/cspan.h
+include/stc/cstr.h
+include/stc/csview.h
+include/stc/ctest.h
+include/stc/deque.h
+include/stc/hmap.h
+include/stc/hset.h
+include/stc/list.h
+include/stc/pqueue.h
+include/stc/priv/cstr_prv.h
+include/stc/priv/linkage.h
+include/stc/priv/linkage2.h
+include/stc/priv/queue_prv.h
+include/stc/priv/sort_prv.h
+include/stc/priv/template.h
+include/stc/priv/template2.h
+include/stc/priv/utf8_prv.h
+include/stc/queue.h
+include/stc/random.h
+include/stc/smap.h
+include/stc/sort.h
+include/stc/sset.h
+include/stc/stack.h
+include/stc/sys/crange.h
+include/stc/sys/filter.h
+include/stc/sys/sumtype.h
+include/stc/sys/utility.h
+include/stc/types.h
+include/stc/utf8.h
+include/stc/vec.h
+include/stc/zsview.h
+%%STATIC%%lib/libstc.a
+lib/libstc.so
+lib/libstc.so.5
+%%PORTDOCS%%%%DOCSDIR%%/README.md
+%%PORTDOCS%%%%DOCSDIR%%/algorithm_api.md
+%%PORTDOCS%%%%DOCSDIR%%/arc_api.md
+%%PORTDOCS%%%%DOCSDIR%%/box_api.md
+%%PORTDOCS%%%%DOCSDIR%%/cbits_api.md
+%%PORTDOCS%%%%DOCSDIR%%/coption_api.md
+%%PORTDOCS%%%%DOCSDIR%%/coroutine_api.md
+%%PORTDOCS%%%%DOCSDIR%%/cregex_api.md
+%%PORTDOCS%%%%DOCSDIR%%/cspan_api.md
+%%PORTDOCS%%%%DOCSDIR%%/cstr_api.md
+%%PORTDOCS%%%%DOCSDIR%%/csview_api.md
+%%PORTDOCS%%%%DOCSDIR%%/deq_api.md
+%%PORTDOCS%%%%DOCSDIR%%/deque_api.md
+%%PORTDOCS%%%%DOCSDIR%%/hmap_api.md
+%%PORTDOCS%%%%DOCSDIR%%/hset_api.md
+%%PORTDOCS%%%%DOCSDIR%%/list_api.md
+%%PORTDOCS%%%%DOCSDIR%%/pics/Figure_1.png
+%%PORTDOCS%%%%DOCSDIR%%/pics/array.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/bitset.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/containers.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/coroutine.png
+%%PORTDOCS%%%%DOCSDIR%%/pics/deque.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/list.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/map.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/queue.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/random.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/set.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/smap.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/sset.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/stack.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/string.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pics/vector.jpg
+%%PORTDOCS%%%%DOCSDIR%%/pqueue_api.md
+%%PORTDOCS%%%%DOCSDIR%%/queue_api.md
+%%PORTDOCS%%%%DOCSDIR%%/random_api.md
+%%PORTDOCS%%%%DOCSDIR%%/smap_api.md
+%%PORTDOCS%%%%DOCSDIR%%/sset_api.md
+%%PORTDOCS%%%%DOCSDIR%%/stack_api.md
+%%PORTDOCS%%%%DOCSDIR%%/utf8_api.md
+%%PORTDOCS%%%%DOCSDIR%%/vec_api.md
+%%PORTDOCS%%%%DOCSDIR%%/zsview_api.md
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/README.md
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/algorithms/filterdemos.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/algorithms/forloops.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/algorithms/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/algorithms/random.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/algorithms/shape.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/algorithms/shape.cpp
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/bitsets/bits.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/bitsets/bits2.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/bitsets/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/bitsets/prime.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/cointerleave.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/coread.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/coroutines.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/dining_philosophers.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/fibonacci.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/filetask.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/generator.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/producer.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/producer_task.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/scheduler.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/coroutines/triples.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/hashmaps/birthday.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/hashmaps/books.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/hashmaps/hashmap.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/hashmaps/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/hashmaps/new_map.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/hashmaps/phonebook.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/hashmaps/unordered_set.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/hashmaps/vikings.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/linkedlists/intrusive.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/linkedlists/list_erase.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/linkedlists/list_splice.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/linkedlists/lists.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/linkedlists/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/linkedlists/new_list.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/make.sh
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/mixed/astar.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/mixed/complex.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/mixed/convert.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/mixed/demos.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/mixed/inits.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/mixed/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/mixed/read.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/priorityqueues/functor.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/priorityqueues/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/priorityqueues/new_pqueue.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/priorityqueues/priority.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/queues/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/queues/new_queue.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/queues/queue.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/regularexpressions/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/regularexpressions/regex1.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/regularexpressions/regex2.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/regularexpressions/regex_match.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/regularexpressions/regex_replace.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/arc_containers.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/arc_demo.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/arcvec_erase.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/box.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/box2.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/map_box.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/map_ptr.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/music_arc.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/new_sptr.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/smartpointers/person_arc.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/gauss2.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/listmap.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/mapmap.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/multimap.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/new_smap.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/smap_erase.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/smap_find.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/smap_insert.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/sorted_map.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/sortedmaps/sset_erase.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/spans/matmult.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/spans/mdspan.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/spans/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/spans/multidim.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/spans/printspan.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/spans/submdspan.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/cstr_match.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/replace.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/splitstr.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/sso_map.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/sso_substr.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/sview_split.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/utf8replace_c.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/strings/utf8replace_rs.rs
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/vectors/lower_bound.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/vectors/meson.build
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/vectors/new_vec.c
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/vectors/stack.c