[Bug-plotutils] Cannot compile plotutils

[Jean Louis]

Impossible to compile the latest version.

/bin/sh ../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..  
-I./../include -DLIBPLOT    -O2 -MT n_write.lo -MD -MP -MF .deps/n_write.Tpo -c 
-o n_write.lo n_write.c
 gcc -DHAVE_CONFIG_H -I. -I.. -I./../include -DLIBPLOT -O2 -MT n_write.lo -MD 
-MP -MF .deps/n_write.Tpo -c n_write.c  -fPIC -DPIC -o .libs/n_write.o
 gcc -DHAVE_CONFIG_H -I. -I.. -I./../include -DLIBPLOT -O2 -MT n_write.lo -MD 
-MP -MF .deps/n_write.Tpo -c n_write.c -o n_write.o >/dev/null 2>&1
mv -f .deps/n_write.Tpo .deps/n_write.Plo
/bin/sh ../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..  
-I./../include -DLIBPLOT    -O2 -MT z_defplot.lo -MD -MP -MF 
.deps/z_defplot.Tpo -c -o z_defplot.lo z_defplot.c
 gcc -DHAVE_CONFIG_H -I. -I.. -I./../include -DLIBPLOT -O2 -MT z_defplot.lo -MD 
-MP -MF .deps/z_defplot.Tpo -c z_defplot.c  -fPIC -DPIC -o .libs/z_defplot.o
 gcc -DHAVE_CONFIG_H -I. -I.. -I./../include -DLIBPLOT -O2 -MT z_defplot.lo -MD 
-MP -MF .deps/z_defplot.Tpo -c z_defplot.c -o z_defplot.o >/dev/null 2>&1
mv -f .deps/z_defplot.Tpo .deps/z_defplot.Plo
/bin/sh ../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..  
-I./../include -DLIBPLOT    -O2 -MT z_write.lo -MD -MP -MF .deps/z_write.Tpo -c 
-o z_write.lo z_write.c
 gcc -DHAVE_CONFIG_H -I. -I.. -I./../include -DLIBPLOT -O2 -MT z_write.lo -MD 
-MP -MF .deps/z_write.Tpo -c z_write.c  -fPIC -DPIC -o .libs/z_write.o
In file included from /usr/include/pngconf.h:50:0,
                 from /usr/include/png.h:350,
                 from z_write.c:43:
z_write.c: In function '_pl_z_maybe_output_image':
z_write.c:167:22: error: dereferencing pointer to incomplete type 'png_struct 
{aka struct png_struct_def'
   if (setjmp (png_ptr->jmpbuf))
                      ^
make[2]: *** [Makefile:698: z_write.lo] Error 1
make[2]: Leaving directory '/sources/gnu/plotutils-2.6/libplot'
make[1]: *** [Makefile:286: all-recursive] Error 1
make[1]: Leaving directory '/sources/gnu/plotutils-2.6'
make: *** [Makefile:216: all] Error 2