diff --git a/ports/librttopo/CONTROL b/ports/librttopo/CONTROL
new file mode 100644
index 00000000000..fd8e85fbbcd
--- /dev/null
+++ b/ports/librttopo/CONTROL
@@ -0,0 +1,5 @@
+Source: librttopo
+Version: 1.1.0-2
+Homepage: https://git.osgeo.org/gitea/rttopo/librttopo
+Description: The RT Topology Library exposes an API to create and manage standard (ISO 13249 aka SQL/MM) topologies using user-provided [data stores] (doc/DATASTORES.md) and released under the GNU GPL license (version 2 or later).
+Build-Depends: geos
diff --git a/ports/librttopo/fix-geoconfig.patch b/ports/librttopo/fix-geoconfig.patch
new file mode 100644
index 00000000000..db6910c8835
--- /dev/null
+++ b/ports/librttopo/fix-geoconfig.patch
@@ -0,0 +1,37 @@
+diff --git a/configure.ac b/configure.ac
+index a9561069c..7adef1bf5 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -87,6 +87,7 @@ AC_CONFIG_FILES([Makefile \
+ #-----------------------------------------------------------------------
+ #   --with-geosconfig
+ #
++if 0; then
+ AC_ARG_WITH([geosconfig],
+     [AS_HELP_STRING([--with-geosconfig=FILE], [specify an alternative geos-config file])],
+ 	[GEOSCONFIG="$withval"], [GEOSCONFIG=""])
+@@ -112,6 +113,7 @@ fi
+ # Extract the linker and include flags
+ GEOS_LDFLAGS=`$GEOSCONFIG --ldflags`
+ GEOS_CFLAGS=-I`$GEOSCONFIG --includes`
++fi
+ AC_SUBST([GEOS_LDFLAGS])
+ AC_SUBST([GEOS_CFLAGS])
+ # Ensure that we can parse geos_c.h
+@@ -120,6 +122,7 @@ CPPFLAGS="$GEOS_CFLAGS"
+ AC_CHECK_HEADERS([geos_c.h],, [AC_MSG_ERROR([could not find geos_c.h - you may need to specify the directory of a geos-config file using --with-geosconfig])])
+ CPPFLAGS="$CPPFLAGS_SAVE"
+ # Ensure we can link against libgeos_c
++if 0; then
+ LIBS_SAVE="$LIBS"
+ LIBS="$GEOS_LDFLAGS"
+ AC_SEARCH_LIBS(GEOSContext_setErrorMessageHandler_r,geos_c,,AC_MSG_ERROR([could not find libgeos_c (or obsolete 'libgeos_c' < v.3.5.0 found) - you may need to specify the directory of a geos-config file using --with-geosconfig]))
+@@ -127,6 +130,8 @@ LIBS="$LIBS_SAVE"
+ LIBS="$LIBS $GEOS_LDFLAGS -lgeos_c"
+ GEOS_MAJOR_VERSION=`$GEOSCONFIG --version | cut -d. -f1 | sed 's/[[^0-9]]//g'`
+ GEOS_MINOR_VERSION=`$GEOSCONFIG --version | cut -d. -f2 | sed 's/[[^0-9]]//g'`
++fi
++LIBS="$LIBS $GEOS_LDFLAGS"
+ RTGEOM_GEOS_VERSION="$GEOS_MAJOR_VERSION$GEOS_MINOR_VERSION"
+ AC_DEFINE_UNQUOTED([RTGEOM_GEOS_VERSION], [$RTGEOM_GEOS_VERSION], [GEOS library version])
+ AC_SUBST([RTGEOM_GEOS_VERSION])
diff --git a/ports/librttopo/fix-makefiles.patch b/ports/librttopo/fix-makefiles.patch
new file mode 100644
index 00000000000..41c6c8f9268
--- /dev/null
+++ b/ports/librttopo/fix-makefiles.patch
@@ -0,0 +1,35 @@
+diff --git a/makefile.vc b/makefile.vc
+index 1f790f0de..2f7e00f7b 100644
+--- a/makefile.vc
++++ b/makefile.vc
+@@ -17,11 +17,11 @@ LIBOBJ	 = src\box2d.obj src\bytebuffer.obj src\g_box.obj \
+ 	src\rtout_kml.obj src\rtout_svg.obj src\rtout_twkb.obj src\rtout_wkb.obj \
+ 	src\rtout_wkt.obj src\rtout_x3d.obj src\rtpoint.obj src\rtpoly.obj src\rtprint.obj \
+ 	src\rtpsurface.obj src\rtspheroid.obj src\rtstroke.obj src\rttin.obj src\rttree.obj \
+-	src\rttriangle.obj src\rtutil.obj src\stringbuffer.obj src\varint.obj
++	src\rttriangle.obj src\rtutil.obj src\stringbuffer.obj src\varint.obj src\rtt_tpsnap.obj
+ 
+ LIBRTTOPO_DLL	 	       =	librttopo$(VERSION).dll
+ 
+-CFLAGS	=	/nologo -IC:\OSGeo4W\include -I. -Iheaders $(OPTFLAGS)
++CFLAGS	=	/nologo -I. -Iheaders $(OPTFLAGS)
+ 
+ default:	all
+ 
+
+diff --git a/nmake.opt b/nmake.opt
+index 938979df1..ea80dab00 100644
+--- a/nmake.opt
++++ b/nmake.opt
+@@ -1,9 +1,8 @@
+ # Directory tree where RTTOPO will be installed.
+-INSTDIR=C:\OSGeo4W
++INSTDIR=$(INSTALLDIR)
+ 
+ # Uncomment the first for an optimized build, or the second for debug.
+-OPTFLAGS=	/nologo /Ox /fp:precise /W4 /MD /D_CRT_SECURE_NO_WARNINGS \
+-			/DDLL_EXPORT
++OPTFLAGS=	/nologo /fp:precise /W4 $(CL_FLAGS) /D_CRT_SECURE_NO_WARNINGS
+ #OPTFLAGS=	/nologo /Zi /MD /Fdlibrttopo.pdb /DDLL_EXPORT
+ 
+ # Set the version number for the DLL.  Normally we leave this blank since
diff --git a/ports/librttopo/portfile.cmake b/ports/librttopo/portfile.cmake
new file mode 100644
index 00000000000..77d7b5932b3
--- /dev/null
+++ b/ports/librttopo/portfile.cmake
@@ -0,0 +1,54 @@
+vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
+
+# NOTE: update the version and checksum for new LIBRTTOPO release
+set(LIBRTTOPO_VERSION_STR "1.1.0-2")
+set(LIBRTTOPO_PACKAGE_SUM "cc2f646dd9ac3099c77e621984cdd2baa676ed1d8e6aaa9642afe2855e6fdef585603cc052ca09084204a1325e38bb626133072fbb5080e8adc369cc4854c40e")
+
+vcpkg_download_distfile(ARCHIVE
+    URLS "https://salsa.debian.org/debian-gis-team/librttopo/-/archive/debian/${LIBRTTOPO_VERSION_STR}/librttopo-debian-${LIBRTTOPO_VERSION_STR}.tar.gz"
+    FILENAME "librttopo${LIBRTTOPO_VERSION_STR}.zip"
+    SHA512 ${LIBRTTOPO_PACKAGE_SUM}
+)
+
+vcpkg_extract_source_archive_ex(
+    ARCHIVE ${ARCHIVE}
+    OUT_SOURCE_PATH SOURCE_PATH
+    PATCHES
+        fix-makefiles.patch
+        fix-geoconfig.patch
+)
+
+if (VCPKG_TARGET_IS_WINDOWS)
+  set(SRID_MAX 999999)
+  set(SRID_USR_MAX 998999)
+  configure_file(${CMAKE_CURRENT_LIST_DIR}/rttopo_config.h.in ${SOURCE_PATH}/src/rttopo_config.h @ONLY)
+  configure_file(${SOURCE_PATH}/headers/librttopo_geom.h.in ${SOURCE_PATH}/headers/librttopo_geom.h @ONLY)
+
+  vcpkg_build_nmake(
+      SOURCE_PATH ${SOURCE_PATH}
+      TARGET librttopo.lib
+  )
+
+  file(GLOB LIBRTTOPO_INCLUDE ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/headers/*.h)
+  file(COPY ${LIBRTTOPO_INCLUDE} DESTINATION ${CURRENT_PACKAGES_DIR}/include)
+
+  file(COPY ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/librttopo.lib DESTINATION ${CURRENT_PACKAGES_DIR}/lib)
+  file(COPY ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg/librttopo.lib DESTINATION ${CURRENT_PACKAGES_DIR}/debug/lib)
+elseif (VCPKG_TARGET_IS_LINUX OR VCPKG_TARGET_IS_OSX) # Build in UNIX
+  vcpkg_configure_make(
+      SOURCE_PATH ${SOURCE_PATH}
+      AUTOCONFIG
+      OPTIONS
+          "GEOS_MAJOR_VERSION=3"
+          "GEOS_MINOR_VERSION=8"
+      OPTIONS_DEBUG
+          "GEOS_LDFLAGS=-lgeos_cd -lgeosd -lm"
+      OPTIONS_RELEASE
+          "GEOS_LDFLAGS=-lgeos_c -lgeos -lm"
+  )
+
+  vcpkg_install_make()
+endif()
+
+# Handle copyright
+file(INSTALL ${SOURCE_PATH}/COPYING DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT} RENAME copyright)
diff --git a/ports/librttopo/rttopo_config.h.in b/ports/librttopo/rttopo_config.h.in
new file mode 100644
index 00000000000..b4b1a39299f
--- /dev/null
+++ b/ports/librttopo/rttopo_config.h.in
@@ -0,0 +1,168 @@
+/* src/rttopo_config.h.  Generated from rttopo_config.h.in by configure.  */
+/* src/rttopo_config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Define to 1 if you have the <assert.h> header file. */
+#define HAVE_ASSERT_H 1
+
+/* Define to 1 if you have the <ctype.h> header file. */
+#define HAVE_CTYPE_H 1
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#define HAVE_DLFCN_H 1
+
+/* Define to 1 if you have the <errno.h> header file. */
+#define HAVE_ERRNO_H 1
+
+/* Define to 1 if you have the `fdatasync' function. */
+#define HAVE_FDATASYNC 1
+
+/* Define to 1 if you have the <float.h> header file. */
+#define HAVE_FLOAT_H 1
+
+/* Define to 1 if you have the `ftruncate' function. */
+#define HAVE_FTRUNCATE 1
+
+/* Define to 1 if you have the <geos_c.h> header file. */
+#define HAVE_GEOS_C_H 1
+
+/* Define to 1 if you have the `getcwd' function. */
+#define HAVE_GETCWD 1
+
+/* Define to 1 if you have the `gettimeofday' function. */
+#define HAVE_GETTIMEOFDAY 1
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#define HAVE_INTTYPES_H 1
+
+/* Define to 1 if you have the `localtime_r' function. */
+#define HAVE_LOCALTIME_R 1
+
+/* Define to 1 if `lstat' has the bug that it succeeds when given the
+   zero-length file name argument. */
+/* #undef HAVE_LSTAT_EMPTY_STRING_BUG */
+
+/* Define to 1 if you have the <math.h> header file. */
+#define HAVE_MATH_H 1
+
+/* Define to 1 if you have the `memmove' function. */
+#define HAVE_MEMMOVE 1
+
+/* Define to 1 if you have the <memory.h> header file. */
+#define HAVE_MEMORY_H 1
+
+/* Define to 1 if you have the `memset' function. */
+#define HAVE_MEMSET 1
+
+/* Define to 1 if you have the `sqrt' function. */
+/* #undef HAVE_SQRT */
+
+/* Define to 1 if `stat' has the bug that it succeeds when given the
+   zero-length file name argument. */
+/* #undef HAVE_STAT_EMPTY_STRING_BUG */
+
+/* Define to 1 if you have the <stdarg.h> header file. */
+#define HAVE_STDARG_H 1
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#define HAVE_STDINT_H 1
+
+/* Define to 1 if you have the <stdio.h> header file. */
+#define HAVE_STDIO_H 1
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#define HAVE_STDLIB_H 1
+
+/* Define to 1 if you have the `strcasecmp' function. */
+#define HAVE_STRCASECMP 1
+
+/* Define to 1 if you have the `strerror' function. */
+#define HAVE_STRERROR 1
+
+/* Define to 1 if you have the `strftime' function. */
+#define HAVE_STRFTIME 1
+
+/* Define to 1 if you have the <strings.h> header file. */
+#define HAVE_STRINGS_H 1
+
+/* Define to 1 if you have the <string.h> header file. */
+#define HAVE_STRING_H 1
+
+/* Define to 1 if you have the `strncasecmp' function. */
+#define HAVE_STRNCASECMP 1
+
+/* Define to 1 if you have the `strstr' function. */
+#define HAVE_STRSTR 1
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#define HAVE_SYS_STAT_H 1
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#define HAVE_SYS_TYPES_H 1
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#define HAVE_UNISTD_H 1
+
+/* rtgeom version */
+#define LIBRTGEOM_VERSION "1.1.0"
+
+/* Define to 1 if `lstat' dereferences a symlink specified with a trailing
+   slash. */
+#define LSTAT_FOLLOWS_SLASHED_SYMLINK 1
+
+/* Define to the sub-directory where libtool stores uninstalled libraries. */
+#define LT_OBJDIR ".libs/"
+
+/* Must be defined in order to disable debug mode. */
+#undef NDEBUG
+
+/* Name of package */
+#define PACKAGE "librttopo"
+
+/* Define to the address where bug reports for this package should be sent. */
+#define PACKAGE_BUGREPORT "strk@kbt.io"
+
+/* Define to the full name of this package. */
+#define PACKAGE_NAME "librttopo"
+
+/* Define to the full name and version of this package. */
+#define PACKAGE_STRING "librttopo 1.1.0"
+
+/* Define to the one symbol short name of this package. */
+#define PACKAGE_TARNAME "librttopo"
+
+/* Define to the home page for this package. */
+#define PACKAGE_URL ""
+
+/* Define to the version of this package. */
+#define PACKAGE_VERSION "1.1.0"
+
+/* RTGEOM Debug level */
+#define RTGEOM_DEBUG_LEVEL 0
+
+/* GEOS library version */
+#define RTGEOM_GEOS_VERSION 38
+
+/* Define to 1 if you have the ANSI C header files. */
+#define STDC_HEADERS 1
+
+/* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
+#define TIME_WITH_SYS_TIME 1
+
+/* Define to 1 if your <sys/time.h> declares `struct tm'. */
+/* #undef TM_IN_SYS_TIME */
+
+/* Version number of package */
+#define VERSION "1.1.0"
+
+/* Define to empty if `const' does not conform to ANSI C. */
+/* #undef const */
+
+/* Define to `long int' if <sys/types.h> does not define. */
+/* #undef off_t */
+
+/* Define to `unsigned int' if <sys/types.h> does not define. */
+/* #undef size_t */
+
+/* Define to empty if the keyword `volatile' does not work. Warning: valid
+   code using `volatile' can become incorrect without. Disable with care. */
+/* #undef volatile */