diff --git a/textproc/py-pyjson5/Makefile b/textproc/py-pyjson5/Makefile
new file mode 100644
index 00000000000..87c839c4887
--- /dev/null
+++ b/textproc/py-pyjson5/Makefile
@@ -0,0 +1,29 @@
+COMMENT=	json5 serializer and parser written in Cython
+
+MODPY_DISTV=	2.0.0
+DISTNAME=	pyjson5-${MODPY_DISTV}
+PKGNAME=	py-${DISTNAME}
+
+# https://pyjson5.readthedocs.io/en/latest/changelog.html
+# https://github.com/Kijewski/pyjson5
+HOMEPAGE=	https://pyjson5.readthedocs.io/
+
+CATEGORIES=	textproc
+
+# Apache 2.0
+PERMIT_PACKAGE=	Yes
+
+WANTLIB += ${COMPILER_LIBCXX} m
+
+COMPILER=	base-clang ports-gcc
+
+MODULES=	lang/python
+MODPY_PYBUILD=	setuptools
+MODPY_PI=	Yes
+
+BUILD_DEPENDS=	lang/cython
+
+# not in sdist; needs submodules to run from git
+NO_TEST=	Yes
+
+.include <bsd.port.mk>
diff --git a/textproc/py-pyjson5/distinfo b/textproc/py-pyjson5/distinfo
new file mode 100644
index 00000000000..281ff844769
--- /dev/null
+++ b/textproc/py-pyjson5/distinfo
@@ -0,0 +1,2 @@
+SHA256 (pyjson5-2.0.0.tar.gz) = fMyYWGz4ff6t+nbejfTJyww9IdG1WeKIEt2WM3SNbiU=
+SIZE (pyjson5-2.0.0.tar.gz) = 305865
diff --git a/textproc/py-pyjson5/patches/patch-setup_py b/textproc/py-pyjson5/patches/patch-setup_py
new file mode 100644
index 00000000000..c0dc91bb4ca
--- /dev/null
+++ b/textproc/py-pyjson5/patches/patch-setup_py
@@ -0,0 +1,11 @@
+Index: setup.py
+--- setup.py.orig
++++ setup.py
+@@ -4,7 +4,6 @@ from setuptools import setup, Extension
+ 
+ extra_compile_args = [
+     "-std=c++11",
+-    "-O3",
+     "-fPIC",
+     "-g0",
+     "-pipe",
diff --git a/textproc/py-pyjson5/patches/patch-third-party_fast_double_parser_include_fast_double_parser_h b/textproc/py-pyjson5/patches/patch-third-party_fast_double_parser_include_fast_double_parser_h
new file mode 100644
index 00000000000..5b51103895b
--- /dev/null
+++ b/textproc/py-pyjson5/patches/patch-third-party_fast_double_parser_include_fast_double_parser_h
@@ -0,0 +1,12 @@
+Index: third-party/fast_double_parser/include/fast_double_parser.h
+--- third-party/fast_double_parser/include/fast_double_parser.h.orig
++++ third-party/fast_double_parser/include/fast_double_parser.h
+@@ -10,7 +10,7 @@
+ #include <cstdlib>
+ #include <cstring>
+ #include <locale.h>
+-#if (defined(sun) || defined(__sun)) 
++#if (defined(sun) || defined(__sun) || defined(__OpenBSD__))
+ #define FAST_DOUBLE_PARSER_SOLARIS
+ #endif
+ 
diff --git a/textproc/py-pyjson5/pkg/DESCR b/textproc/py-pyjson5/pkg/DESCR
new file mode 100644
index 00000000000..ee8f5966c97
--- /dev/null
+++ b/textproc/py-pyjson5/pkg/DESCR
@@ -0,0 +1,11 @@
+JSON5 serializer and parser library for Python 3 written in Cython.
+
+The serializer returns ASCII data that can safely be used in an HTML
+template. Apostrophes, ampersands, greater-than, and less-then signs are
+encoded as unicode escaped sequences.
+
+Unless the input contains infinite or NaN values, the result will be
+valid JSON data.
+
+The parser can handle all valid JSON5 1.0.0 and JSON data can be read,
+unless the nesting level is absurdly high.
diff --git a/textproc/py-pyjson5/pkg/PLIST b/textproc/py-pyjson5/pkg/PLIST
new file mode 100644
index 00000000000..ed2013d6591
--- /dev/null
+++ b/textproc/py-pyjson5/pkg/PLIST
@@ -0,0 +1,16 @@
+lib/python${MODPY_VERSION}/site-packages/pyjson5/
+lib/python${MODPY_VERSION}/site-packages/pyjson5-${MODPY_DISTV}.dist-info/
+lib/python${MODPY_VERSION}/site-packages/pyjson5-${MODPY_DISTV}.dist-info/METADATA
+lib/python${MODPY_VERSION}/site-packages/pyjson5-${MODPY_DISTV}.dist-info/RECORD
+lib/python${MODPY_VERSION}/site-packages/pyjson5-${MODPY_DISTV}.dist-info/WHEEL
+lib/python${MODPY_VERSION}/site-packages/pyjson5-${MODPY_DISTV}.dist-info/licenses/
+lib/python${MODPY_VERSION}/site-packages/pyjson5-${MODPY_DISTV}.dist-info/licenses/LICENSE.Apache
+lib/python${MODPY_VERSION}/site-packages/pyjson5-${MODPY_DISTV}.dist-info/licenses/LICENSE.MIT
+lib/python${MODPY_VERSION}/site-packages/pyjson5-${MODPY_DISTV}.dist-info/top_level.txt
+lib/python${MODPY_VERSION}/site-packages/pyjson5/__init__.py
+lib/python${MODPY_VERSION}/site-packages/pyjson5/__init__.pyi
+lib/python${MODPY_VERSION}/site-packages/pyjson5/${MODPY_PYCACHE}/
+lib/python${MODPY_VERSION}/site-packages/pyjson5/${MODPY_PYCACHE}__init__.${MODPY_PYC_MAGIC_TAG}${MODPY_PYOEXTENSION}
+lib/python${MODPY_VERSION}/site-packages/pyjson5/${MODPY_PYCACHE}__init__.${MODPY_PYC_MAGIC_TAG}pyc
+lib/python${MODPY_VERSION}/site-packages/pyjson5/py.typed
+@so lib/python${MODPY_VERSION}/site-packages/pyjson5/pyjson5.${MODPY_PYC_MAGIC_TAG}so