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3 changes: 2 additions & 1 deletion build/pkgs/zlib/spkg-configure.m4
Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
SAGE_SPKG_CONFIGURE([zlib], [
PKG_CHECK_MODULES([zlib], [zlib >= 1.2.11], [zlib_cv_pc=yes], [zlib_cv_pc=no])
AC_CHECK_LIB([z], [inflateEnd], [zlib_cv_libz=yes], [zlib_cv_libz=no])
AC_CHECK_HEADER([zlib.h], [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
if test "$zlib_cv_libz" = "yes" && test "$zlib_cv_zlib_h" = "yes"; then
if test "$zlib_cv_pc" = "yes" && test "$zlib_cv_libz" = "yes" && test "$zlib_cv_zlib_h" = "yes"; then
PKG_CHECK_MODULES([LIBPNG], [libpng >= 1.2], [], [
dnl inflateValidate is needed for Sage's libpng, newer than 1.2; this ensures
dnl we have the minimum required for building zlib version
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