Apparently -framework is a link flag, not a compile one

src/build/Common.gmake

@@ -436,11 +436,6 @@ else
 endif
 
 SHLIBOPTS   :=  -shared
-ifeq ($(os),darwin)
- MKSHLIB        :=  libtool -dynamic -framework System -lcc_dynamic
- MKSHPPLIB      :=  libtool -dynamic -framework System -lcc_dynamic -lstdc++
- SHLIBOPTS  :=
-else
 ifeq ($(os),sunos)
  MKSHLIB       :=  /usr/ccs/bin/ld -G
  MKSHPPLIB     :=  /usr/ccs/bin/ld -G
@@ -449,7 +444,6 @@ else
  MKSHLIB       :=  $(CC)
  MKSHPPLIB     :=  $(CXX)
 endif
-endif
 
 # Paths
 XPDEV_SRC	:=	$(SRC_ROOT)$(DIRSEP)xpdev

src/conio/Common.gmake

@@ -103,7 +103,7 @@ ifdef USE_SDL
   ifeq ($(os),darwin)
    ifeq ($(shell if [ -d /Library/Frameworks/SDL2.framework ] ; then echo YES ; fi),YES)
     SDL_FRAMEWORK_PATH ?= /Library/Frameworks
-    CFLAGS += -F${SDL_FRAMEWORK_PATH} -framework SDL2
+    CFLAGS += -F${SDL_FRAMEWORK_PATH}
    endif
    ifdef SDL_FRAMEWORK_PATH
     WITH_SDL	:=	1

src/xpdev/Common.gmake

@@ -105,7 +105,7 @@ ifdef USE_SDL_AUDIO
   ifeq ($(os),darwin)
    ifeq ($(shell if [ -d /Library/Frameworks/SDL2.framework ] ; then echo YES ; fi),YES)
     SDL_FRAMEWORK_PATH ?= /Library/Frameworks
-    CFLAGS += -F${SDL_FRAMEWORK_PATH} -framework SDL2
+    CFLAGS += -F${SDL_FRAMEWORK_PATH}
    endif
    ifdef SDL_FRAMEWORK_PATH
     WITH_SDL_AUDIO	:=	1