Fix Debian build

AppKit/X11.subproj/KTFont_FT.h

@@ -8,6 +8,10 @@
 
 #import <AppKit/KTFont.h>
 
+#ifdef DARLING
+#define __linux__
+#endif
+
 #import <stddef.h>
 #import <ft2build.h>
 
@@ -17,6 +21,10 @@ typedef int ptrdiff_t;
 #import FT_FREETYPE_H
 #import FT_RENDER_H
 
+#ifdef DARLING
+#undef __linux__
+#endif
+
 @class NSSet;
 
 @interface KTFont_FT : KTFont

AppKit/X11.subproj/O2FontState_cairo.h

@@ -1,6 +1,15 @@
 #import <Onyx2D/O2Geometry.h>
+
+#ifdef DARLING
+#define __linux__
+#endif
+
 #import <cairo/cairo-ft.h>
 
+#ifdef DARLING
+#undef __linux__
+#endif
+
 @class O2Font_FT;
 
 @interface O2FontState_cairo : NSObject {

AppKit/X11.subproj/O2Font_FT.h

@@ -1,11 +1,19 @@
 #import <Onyx2D/O2Font.h>
 
+#ifdef DARLING
+#define __linux__
+#endif
+
 #import <stddef.h>
 #import <ft2build.h>
 #import FT_FREETYPE_H
 #import FT_RENDER_H
 #import <fontconfig/fontconfig.h>
 
+#ifdef DARLING
+#undef __linux__
+#endif
+
 @interface O2Font_FT : O2Font {
     FT_Face _face;
 }

Onyx2D/CMakeLists.txt

@@ -13,6 +13,9 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} \
 )
 
 find_package(Freetype REQUIRED)
+find_package(PNG REQUIRED)
+find_package(TIFF REQUIRED)
+find_package(JPEG REQUIRED)
 
 include_directories(
 	${CMAKE_SOURCE_DIR}/src/external/foundation/include
@@ -37,6 +40,9 @@ include_directories(
 	${CMAKE_CURRENT_SOURCE_DIR}/../CoreText
 
 	${FREETYPE_INCLUDE_DIRS}
+	${PNG_INCLUDE_DIRS}
+	${TIFF_INCLUDE_DIRS}
+	${JPEG_INCLUDE_DIRS}
 )
 
 set(Onyx2D_sources

Onyx2D/O2Font_freetype.h

@@ -3,9 +3,17 @@
 
 #ifdef FREETYPE_PRESENT
 
+#ifdef DARLING
+#define __linux__
+#endif
+
 #include <ft2build.h>
 #include FT_FREETYPE_H
 
+#ifdef DARLING
+#undef __linux__
+#endif
+
 @interface O2Font_freetype : O2Font {
     FT_Face _face;
     FT_Encoding _ftEncoding;