diff --git a/configure.ac b/configure.ac
index 5e2fe435a222..26641bbc23ce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12172,11 +12172,6 @@ if test "$enable_skia" != "no" -a "$build_skia" = "yes" -a -z "$DISABLE_GUI"; th
             SKIA_GPU=VULKAN
             AC_SUBST(SKIA_GPU)
         fi
-
-        if test -n "$MAC_OS_X_VERSION_MIN_REQUIRED" && test "$MAC_OS_X_VERSION_MIN_REQUIRED" -lt "101200"; then
-            SKIA_DISABLE_VMA_USE_STL_SHARED_MUTEX=1
-            AC_SUBST(SKIA_DISABLE_VMA_USE_STL_SHARED_MUTEX)
-        fi
     else
         AC_MSG_RESULT([no (freetype too old)])
         add_warning "freetype version is too old for Skia library, at least 2.8.1 required, Skia support disabled"
diff --git a/external/firebird/ExternalProject_firebird.mk b/external/firebird/ExternalProject_firebird.mk
index 0419109e7156..29a71763600f 100644
--- a/external/firebird/ExternalProject_firebird.mk
+++ b/external/firebird/ExternalProject_firebird.mk
@@ -84,11 +84,6 @@ $(call gb_ExternalProject_get_state_target,firebird,build):
 			, \
 				--enable-shared --disable-static \
 			) \
-			$(if $(filter MACOSX,$(OS)), \
-				$(if $(filter 1, \
-						$(shell expr '$(MAC_OS_X_VERSION_MIN_REQUIRED)' \
-							'<' 101200)), \
-					ac_cv_func_clock_gettime=no)) \
 			$(if $(HAVE_LIBCPP),CXX='$(CXX) -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR') \
 		&& LC_ALL=C $(MAKE) \
 			$(if $(ENABLE_DEBUG),Debug) SHELL='$(SHELL)' $(if $(filter LINUX,$(OS)),CXXFLAGS="$$CXXFLAGS -std=gnu++11") \
diff --git a/external/libpng/UnpackedTarball_libpng.mk b/external/libpng/UnpackedTarball_libpng.mk
index 2a8ad3f84406..dca4e4b5cfe9 100644
--- a/external/libpng/UnpackedTarball_libpng.mk
+++ b/external/libpng/UnpackedTarball_libpng.mk
@@ -15,8 +15,4 @@ $(eval $(call gb_UnpackedTarball_add_files,libpng,.,\
 	external/libpng/configs/pnglibconf.h \
 ))
 
-$(eval $(call gb_UnpackedTarball_add_patches,libpng,\
-	external/libpng/libpng-osx.patch.1 \
-))
-
 # vim: set noet sw=4 ts=4:
diff --git a/external/libpng/libpng-osx.patch.1 b/external/libpng/libpng-osx.patch.1
deleted file mode 100644
index 387b3a8cc613..000000000000
--- a/external/libpng/libpng-osx.patch.1
+++ /dev/null
@@ -1,16 +0,0 @@
--*- Mode: Diff -*-
-
-Avoid warning: 'inflateValidate' is only available on macOS 10.13 or newer [-Wunguarded-availability-new]
-
---- a/pngrutil.c
-+++ b/pngrutil.c
-@@ -422,7 +422,8 @@
-       }
- 
- #if ZLIB_VERNUM >= 0x1290 && \
--   defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_IGNORE_ADLER32)
-+   defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_IGNORE_ADLER32) && \
-+   !(defined(MAC_OS_X_VERSION_MIN_REQUIRED) && MAC_OS_X_VERSION_MIN_REQUIRED < 101300)
-       if (((png_ptr->options >> PNG_IGNORE_ADLER32) & 3) == PNG_OPTION_ON)
-          /* Turn off validation of the ADLER32 checksum in IDAT chunks */
-          ret = inflateValidate(&png_ptr->zstream, 0);
diff --git a/external/python3/ExternalProject_python3.mk b/external/python3/ExternalProject_python3.mk
index f1b71a037b4a..faa8e97387d4 100644
--- a/external/python3/ExternalProject_python3.mk
+++ b/external/python3/ExternalProject_python3.mk
@@ -100,7 +100,6 @@ $(call gb_ExternalProject_get_state_target,python3,build) :
             ) \
 			--enable-framework=/@__________________________________________________OOO --with-framework-name=LibreOfficePython, \
 			--enable-shared \
-			$(if $(filter 1090 101000 101100 101200,$(MAC_OS_X_VERSION_MIN_REQUIRED)),ac_cv_func_utimensat=no) \
 		) \
 		$(if $(ENABLE_OPENSSL),$(if $(SYSTEM_OPENSSL),,\
 			--with-openssl=$(call gb_UnpackedTarball_get_dir,openssl) \