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FS#172 - GD's configure is unable to find and use libpng-config if it is not in the system path
User who did this - Normand Savard (nsavard)

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I tested with 2.0.36RC1 and the configure script still cannot find the png library.  The output from the configure script is shown below.  I also attached the config.log file.

<code>
The png library is really installed.  See:
ls /home/fgs/fgs-dev/built/libpng/include/libpng12
pngconf.h  png.h


Output of configure script:
checking for sin in -lm... yes
checking for deflate in -lz... no
configure: WARNING: zlib is required - see http://www.gzip.org/zlib/
checking png.h usability... no
checking png.h presence... no
checking for png.h... no
checking libpng/png.h usability... no
checking libpng/png.h presence... no
checking for libpng/png.h... no
checking for png_create_read_struct in -lpng12... no
configure: WARNING: libpng is required - see http://www.libpng.org/pub/png/
checking for freetype-config... /home/fgs/fgs-dev/built/freetype/bin/freetype-config
checking for FT_Init_FreeType in -lfreetype... yes
checking ft2build.h usability... yes
checking ft2build.h presence... yes
checking for ft2build.h... yes
checking for FcInit in -lfontconfig... no
checking for jpeg_set_defaults in -ljpeg... yes
checking for the pthreads library -lpthreads... no
checking whether pthreads work without any flags... no
checking whether pthreads work with -Kthread... no
checking whether pthreads work with -kthread... no
checking for the pthreads library -llthread... no
checking whether pthreads work with -pthread... yes
checking for joinable pthread attribute... PTHREAD_CREATE_JOINABLE
checking if more special flags are required for pthreads... no

** Configuration summary for gd 2.0.36:

   Support for PNG library:          
   Support for JPEG library:         yes
   Support for Freetype 2.x library: yes
   Support for Fontconfig library:   no
   Support for Xpm library:          no
   Support for pthreads:             yes

configure: creating ./config.status
config.status: creating Makefile
config.status: creating config/Makefile
config.status: creating config/gdlib-config
config.status: creating test/Makefile
config.status: creating config.h
config.status: executing depfiles commands
cd . && /bin/sh /home/fgs/fgs-dev/src/gd-2.0.36RC1/config/missing --run aclocal-1.10 -I config
configure.ac:64: warning: macro `AM_ICONV' not found in library
 cd . && /bin/sh /home/fgs/fgs-dev/src/gd-2.0.36RC1/config/missing --run automake-1.10 --foreign 
Makefile.am:18: Libtool library used but `LIBTOOL' is undefined
Makefile.am:18:   The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL'
Makefile.am:18:   to `configure.ac' and run `aclocal' and `autoconf' again.
Makefile.am:18:   If `AC_PROG_LIBTOOL' is in `configure.ac', make sure
Makefile.am:18:   its definition is in aclocal's search path.
make: *** [Makefile.in] Error 1
</code>
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