2 files changed, 47 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/config.h.in b/Build/source/texk/dvisvgm/config.h.in
index aa5bbd51f51..a05ced4c230 100644
--- a/Build/source/texk/dvisvgm/config.h.in
+++ b/Build/source/texk/dvisvgm/config.h.in
@@ -172,6 +172,9 @@
 /* Version number of package */
 #undef VERSION
 
+/* Define to 1 if <zlib.h> declares 'z_const'. */
+#undef ZLIB_CONST
+
 /* Enable large inode numbers on Mac OS X 10.5.  */
 #ifndef _DARWIN_USE_64_BIT_INODE
 # define _DARWIN_USE_64_BIT_INODE 1
@@ -210,3 +213,6 @@
 /* Define to the type of an unsigned integer type of width exactly 64 bits if
    such a type exists and the standard includes do not define it. */
 #undef uint64_t
+
+/* Define as empty if not declared in <zlib.h>. */
+#undef z_const
diff --git a/Build/source/texk/dvisvgm/configure b/Build/source/texk/dvisvgm/configure
index 0426a5455de..f040ac95c3b 100755
--- a/Build/source/texk/dvisvgm/configure
+++ b/Build/source/texk/dvisvgm/configure
@@ -19089,6 +19089,47 @@ $(ZLIB_DEPEND): ${top_builddir}/../../libs/zlib/include/zconf.h
 ${top_builddir}/../../libs/zlib/include/zconf.h:
 	cd ${top_builddir}/../../libs/zlib && $(MAKE) $(AM_MAKEFLAGS) rebuild'
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if <zlib.h> defines 'z_const'" >&5
+$as_echo_n "checking if <zlib.h> defines 'z_const'... " >&6; }
+if ${kpse_cv_have_decl_z_const+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  eval CPPFLAGS=\"$ZLIB_INCLUDES \$CPPFLAGS\"
+eval LIBS=\"$ZLIB_LIBS \$LIBS\"
+
+                cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <zlib.h>
+int
+main ()
+{
+z_const char * foo();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  kpse_cv_have_decl_z_const=yes
+else
+  kpse_cv_have_decl_z_const=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+                CPPFLAGS=$kpse_save_CPPFLAGS
+LIBS=$kpse_save_LIBS
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $kpse_cv_have_decl_z_const" >&5
+$as_echo "$kpse_cv_have_decl_z_const" >&6; }
+case $kpse_cv_have_decl_z_const in #(
+  yes) :
+
+$as_echo "#define ZLIB_CONST 1" >>confdefs.h
+ ;; #(
+  *) :
+
+$as_echo "#define z_const /**/" >>confdefs.h
+ ;;
+esac
 
 ## _KPSE_LIB_FLAGS: Setup freetype2 (-lfreetype) flags