+# define source file for png
+PNG_C_SRC=\
+ png/png.c \
+ png/pngset.c \
+ png/pngget.c \
+ png/pngrutil.c \
+ png/pngtrans.c \
+ png/pngwutil.c \
+ png/pngread.c \
+ png/pngrio.c \
+ png/pngwio.c \
+ png/pngwrite.c \
+ png/pngrtran.c \
+ png/pngwtran.c \
+ png/pngmem.c \
+ png/pngerror.c \
+ png/pngpread.c
+
+# define source file for zlib
+Z_C_SRC=\
+ zlib/adler32.c \
+ zlib/compress.c \
+ zlib/crc32.c \
+ zlib/gzio.c \
+ zlib/uncompr.c \
+ zlib/deflate.c \
+ zlib/trees.c \
+ zlib/zutil.c \
+ zlib/inflate.c \
+ zlib/infblock.c \
+ zlib/inftrees.c \
+ zlib/infcodes.c \
+ zlib/infutil.c \
+ zlib/inffast.c
+