--- Makerules.orig	2023-11-24 18:10:54 UTC
+++ Makerules
@@ -331,3 +331,43 @@ ifeq "$(OS)" "ios"
   LD = xcrun ld
   RANLIB = xcrun ranlib
 endif
+
+
+# added from FreeBSD ports
+PTHREAD_LIBS := -lthr
+USE_SYSTEM_CURL := yes
+SYS_CURL_CFLAGS := $(shell pkg-config --cflags libcurl)
+SYS_CURL_LIBS := $(shell pkg-config --libs libcurl)
+USE_SYSTEM_FREETYPE := yes
+SYS_FREETYPE_CFLAGS := $(shell pkg-config --cflags freetype2)
+SYS_FREETYPE_LIBS := $(shell pkg-config --libs freetype2)
+HAVE_GLUT := yes
+USE_SYSTEM_GLUT := yes
+SYS_GLUT_CFLAGS := $(shell pkg-config --cflags gl glut)
+SYS_GLUT_LIBS := $(shell pkg-config --libs gl glut)
+USE_SYSTEM_HARFBUZZ := yes
+SYS_HARFBUZZ_CFLAGS := $(shell pkg-config --cflags harfbuzz)
+SYS_HARFBUZZ_LIBS := $(shell pkg-config --libs harfbuzz)
+USE_SYSTEM_JBIG2DEC := yes
+SYS_JBIG2DEC_CFLAGS := $(shell pkg-config --cflags jbig2dec)
+SYS_JIB2DEC_LIBS := $(shell pkg-config --libs jbig2dec)
+USE_SYSTEM_LCMS2 := no
+HAVE_LIBCRYPTO := no
+SYS_LIBCRYPTO_CFLAGS :=
+SYS_LIBCRYPTO_LIBS :=
+USE_SYSTEM_LIBJPEG := yes
+SYS_LIBJPEG_CFLAGS := $(shell pkg-config --cflags libjpeg)
+SYS_LIBJPEG_LIBS := $(shell pkg-config --libs libjpeg)
+USE_SYSTEM_OPENJPEG := yes
+SYS_OPENJPEG_CFLAGS := $(shell pkg-config --cflags libopenjp2)
+SYS_OPENJPEG_LIBS := $(shell pkg-config --libs libopenjp2)
+HAVE_OPENSSL_SSL := no
+HAVE_PTHREAD := yes
+SYS_PTHREAD_CFLAGS :=
+SYS_PTHREAD_LIBS := -lpthread
+HAVE_X11 := yes
+X11_CFLAGS := $(shell pkg-config --cflags x11 xext)
+X11_LIBS := $(shell pkg-config --libs x11 xext)
+USE_SYSTEM_ZLIB := yes
+SYS_ZLIB_CFLAGS := $(shell pkg-config --cflags zlib)
+SYS_ZLIB_LIBS := $(shell pkg-config --libs zlib)