gnustep-gui-0.9.4 and libpng path configuring

[T.J. Yang]

from ./configure --help of gnustep-gui-0.9.4

<snip>
Optional Packages:
 --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
 --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
 --with-x                use the X Window System
 --with-jpeg-library=DIR JPEG library file are in DIR
 --with-jpeg-include=DIR JPEG include files are in DIR
 --with-tiff-library=DIR TIFF library file are in DIR
 --with-tiff-include=DIR TIFF include files are in DIR
 --with-ungif-library=DIR UNGIF library file are in DIR
 --with-ungif-include=DIR UNGIF include files are in DIR
 --with-audiofile-library=DIR AUDIOFILE library file are in DIR
 --with-audiofile-include=DIR AUDIOFILE include files are in DIR

How can I specified path for png libirary ?

I am getting png.h not found error when building it.

<snip>
gmake[1]: Entering directory `/opt/build/gnustep-gui-0.9.4/Source'
Making all for library libgnustep-gui...
Compiling file Functions.m ...
Compiling file NSActionCell.m ...
Compiling file NSAffineTransform.m ...
Compiling file NSAlert.m ...
Compiling file NSApplication.m ...
Compiling file NSAttributedString.m ...
Compiling file NSBezierPath.m ...
Compiling file NSBitmapImageRep.m ...
Compiling file NSBitmapImageRep+GIF.m ...
Compiling file NSBitmapImageRep+JPEG.m ...
Compiling file NSBitmapImageRep+PNG.m ...
NSBitmapImageRep+PNG.m:34:17: warning: png.h: No such file or directory
NSBitmapImageRep+PNG.m: In function `+[NSBitmapImageRep(PNG) 
_bitmapIsPNG:]':
NSBitmapImageRep+PNG.m:48: warning: implicit declaration of function 
`png_sig_cmp'
NSBitmapImageRep+PNG.m:48: error: `png_bytep' undeclared (first use in this 
function)
NSBitmapImageRep+PNG.m:48: error: (Each undeclared identifier is reported 
only once
NSBitmapImageRep+PNG.m:48: error: for each function it appears in.)

why there is no --with-png-libary option in ./configure ?

Thanks for your pointer


T.J. Yang

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