FREQUENCIES: Get rid of final (non-const) file-scope variable.

[pspp] / configure.ac

diff --git a/configure.ac b/configure.ac
index 4d6cab7c2229b656041ae4668db9d9bf83402391..a3a07a87e07816848ffd8f9c8416e20a8d9913ee 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -76,6 +76,12 @@ AM_CONDITIONAL([HAVE_GUI],
 if test "$with_cairo" != no && test "$with_gui" != "no"; then
   PKG_CHECK_MODULES([GTK], [gtk+-2.0 >= 2.12], [],
     [PSPP_REQUIRED_PREREQ([gtk+ 2.0 version 2.12 or later (or use --without-gui)])])
+
+  AC_ARG_VAR([GLIB_GENMARSHAL])
+  AC_CHECK_PROGS([GLIB_GENMARSHAL], [glib-genmarshal])
+  if test "x$GLIB_GENMARSHAL" = x; then
+    PSPP_REQUIRED_PREREQ([glib-genmarshal (or use --without-gui)])
+  fi
 fi
 
 dnl Checks needed for psql reader
@@ -145,6 +151,18 @@ AC_CHECK_HEADERS(
   [HAVE_ZLIB=no
    PSPP_OPTIONAL_PREREQ([zlib])])
 
+dnl Avoid interference between zlib's crc32() function and gnulib's
+dnl crc32() function, which have different signatures.  PSPP calls
+dnl only gnulib's crc32() directly, but it calls zlib's crc32()
+dnl indirectly through other zlib calls.  If we don't rename gnulib's
+dnl crc32(), then zlib will call gnulib's version instead of its own,
+dnl causing failures.  (This can happen even if zlib isn't detected
+dnl directly, because other libraries that PSPP uses, e.g. libpng,
+dnl sometimes use zlib themselves.)
+AC_DEFINE(
+  [crc32], [gl_crc32],
+  [Avoid making zlib call gnulib's crc32() instead of its own.])
+
 dnl Gnumeric support requires libxml2 and zlib.
 if test $HAVE_LIBXML2 = yes && test $HAVE_ZLIB = yes; then
   GNM_SUPPORT=yes