port build-script from SDL3

[ci skip]

mingw/pkg-support/Makefile

@@ -12,7 +12,10 @@ native:
 	make install-package arch=i686-w64-mingw32 prefix=/usr
 
 cross:
+	mkdir -p $(CROSS_PATH)/cmake
+	cp -rv cmake/* $(CROSS_PATH)/cmake
 	for arch in $(ARCHITECTURES); do \
+	    mkdir -p $(CROSS_PATH)/$$arch; \
 	    make install-package arch=$$arch prefix=$(CROSS_PATH)/$$arch; \
 	done
 
@@ -21,7 +24,13 @@ install-package:
 	    (cd $(arch) && cp -rv bin include lib share $(prefix)/); \
 	    sed "s|^prefix=.*|prefix=$(prefix)|" <$(arch)/bin/sdl2-config >$(prefix)/bin/sdl2-config; \
 	    chmod 755 $(prefix)/bin/sdl2-config; \
-	    sed "s|^prefix=.*|prefix=$(prefix)|" <$(arch)/lib/pkgconfig/sdl2.pc >$(prefix)/lib/pkgconfig/sdl2.pc; \
+	    sed "s|^libdir=.*|libdir=\'$(prefix)/lib\'|" <$(arch)/lib/libSDL2.la >$(prefix)/lib/libSDL2.la; \
+	    sed -e "s|^set[(]bindir \".*|set(bindir \"$(prefix)/bin\")|" \
+	    	-e "s|^set[(]includedir \".*|set(includedir \"$(prefix)/include\")|" \
+	    	-e "s|^set[(]libdir \".*|set(libdir \"$(prefix)/lib\")|" <$(arch)/lib/cmake/SDL2/sdl2-config.cmake >$(prefix)/lib/cmake/SDL2/sdl2-config.cmake; \
+	    sed -e "s|^prefix=.*|prefix=$(prefix)|" \
+	    	-e "s|^includedir=.*|includedir=$(prefix)/include|" \
+	    	-e "s|^libdir=.*|prefix=$(prefix)/lib|" <$(arch)/lib/pkgconfig/sdl2.pc >$(prefix)/lib/pkgconfig/sdl2.pc; \
 	else \
 	    echo "*** ERROR: $(arch) or $(prefix) does not exist!"; \
 	    exit 1; \