diff --git a/deps/Cocoa-deps/libpng/libpng.xcodeproj/project.pbxproj b/deps/Cocoa-deps/libpng/libpng.xcodeproj/project.pbxproj
index 8c233a1b..2df52b09 100644
--- a/deps/Cocoa-deps/libpng/libpng.xcodeproj/project.pbxproj
+++ b/deps/Cocoa-deps/libpng/libpng.xcodeproj/project.pbxproj
@@ -293,12 +293,10 @@
 				GENERATE_MASTER_OBJECT_FILE = YES;
 				HEADER_SEARCH_PATHS = "\"$(SRCROOT)/src/Core/Materials/\"";
 				INSTALL_PATH = /usr/local/lib;
-				MACOSX_DEPLOYMENT_TARGET = 10.5;
 				ONLY_ACTIVE_ARCH = YES;
 				PREBINDING = NO;
 				PRODUCT_NAME = png_for_oolite;
 				PUBLIC_HEADERS_FOLDER_PATH = include/png/;
-				SDKROOT = macosx10.5;
 				SYMROOT = ../../../build;
 			};
 			name = Debug;