Fixed some OS X 10.7 build errors.

build/GNUmakefile.example

@@ -33,7 +33,7 @@ ifeq ($(TOOLCHAIN),gcc)
 	LDFLAGS += -L$(OUTDIR) -lui
 	# see build/GNUmakefile.test
 	ifeq ($(OS),darwin)
-		LDFLAGS += -Wl,-rpath,@executable_path
+		LDFLAGS += -Wl,-rpath,@executable_path/
 	else
 		LDFLAGS += -Wl,-rpath,'$$ORIGIN'
 	endif

build/GNUmakefile.test

@@ -18,8 +18,9 @@ ifeq ($(TOOLCHAIN),gcc)
 	# tell the dynamic loader to search in the executable path for shared objects
 	# note: OS X's linker complains if we say -rpath= instead of -rpath,
 	# also note that OS X doesn't use $ORIGIN - see http://jorgen.tjer.no/post/2014/05/20/dt-rpath-ld-and-at-rpath-dyld/
+	# the extra slash is needed on OS X 10.7
 	ifeq ($(OS),darwin)
-		LDFLAGS += -Wl,-rpath,@executable_path
+		LDFLAGS += -Wl,-rpath,@executable_path/
 	else
 		LDFLAGS += -Wl,-rpath,'$$ORIGIN'
 	endif

darwin/uipriv_darwin.h

@@ -10,6 +10,9 @@
 #error Sorry, libui cannot be compiled with ARC.
 #endif
 
+// 10.7 fixups
+#define NSEventModifierFlags NSUInteger
+
 #define toNSString(str) [NSString stringWithUTF8String:(str)]
 #define fromNSString(str) [(str) UTF8String]