Define ZLIB_CONST so we get the const version of the API.

diff --git a/configure b/configure
index 2f26c53fdf0afa24dc78888e0ce52a709d5d54c1..d600035c6ec5c7b166d47ca7a1d7c51e733034bc 100755 (executable)
--- a/configure
+++ b/configure
@@ -6323,6 +6323,38 @@ else
 fi
 
 
+if ${CPPFLAGS+:} false; then :
+
+  case " $CPPFLAGS " in #(
+  *" -DZLIB_CONST "*) :
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: : CPPFLAGS already contains -DZLIB_CONST"; } >&5
+  (: CPPFLAGS already contains -DZLIB_CONST) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } ;; #(
+  *) :
+
+     as_fn_append CPPFLAGS " -DZLIB_CONST"
+     { { $as_echo "$as_me:${as_lineno-$LINENO}: : CPPFLAGS=\"\$CPPFLAGS\""; } >&5
+  (: CPPFLAGS="$CPPFLAGS") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+     ;;
+esac
+
+else
+
+  CPPFLAGS=-DZLIB_CONST
+  { { $as_echo "$as_me:${as_lineno-$LINENO}: : CPPFLAGS=\"\$CPPFLAGS\""; } >&5
+  (: CPPFLAGS="$CPPFLAGS") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+
+fi
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable environment resetting by default" >&5
 $as_echo_n "checking whether to enable environment resetting by default... " >&6; }
 # Check whether --enable-env_reset was given.

diff --git a/configure.ac b/configure.ac
index 91eeb5d11f73a13d9a7756eb31dbb83226a408f4..562f51acb56bddd416a037d1d9ab5142d583f8a0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1420,6 +1420,7 @@ AC_ARG_ENABLE(env_debug,
 AC_ARG_ENABLE(zlib,
 [AS_HELP_STRING([--enable-zlib[[=PATH]]], [Whether to enable or disable zlib])],
 [], [enable_zlib=yes])
+AX_APPEND_FLAG([-DZLIB_CONST], [CPPFLAGS])
 
 AC_MSG_CHECKING(whether to enable environment resetting by default)
 AC_ARG_ENABLE(env_reset,