configure test for libpng fails with >=libpng-1.4

[pavelo]

checking whether libpng is installed... yes
checking for png_check_sig... no
configure: error: You need libpng to compile Armagetron.

the problem is that configure checks for the existance of the png_check_sig() function. however, in new libpng this is defined as a macro so the test blows up. I simply replaced the tested function with png_sig_cmp() and it works like a charm :)

(i haven't checked, but i assume png_sig_cmp() also exists on older versions of libpng)

Index: configure.ac
===================================================================
--- configure.ac (revision 9424)
+++ configure.ac (working copy)
@@ -981,7 +980,7 @@
 CPPFLAGS="$CPPFLAGS `libpng-config --cflags`"
 LIBS="$LIBS $PNGLIBS"

-AC_CHECK_FUNC(png_check_sig,
+AC_CHECK_FUNC(png_sig_cmp,
 ,
 AC_MSG_ERROR([You need libpng to compile Armagetron.]))

[Luke-Jr (luke-jr)]

I think this is already fixed somewhere...

[pavelo (pavelo)]

i checked the main bzr branch and svn... they both exhibit the problem....

[dlh (dlh)]

Was fixed in bzr revno 1198 for 0.2.8 on 2010-03-19, and the fixed was merged into trunk cleanly.