Index: m4/libunixodbc.m4
===================================================================
--- m4/libunixodbc.m4	(revision 8090)
+++ m4/libunixodbc.m4	(working copy)
@@ -64,7 +64,7 @@
 		LIBS="${LIBS} ${UNIXODBC_LIBS}"
 
 		AC_CACHE_CHECK([whether unixodbc is usable],
-			[_libunixodbc_usable],
+			[_cv_libunixodbc_usable],
 			[AC_LINK_IFELSE(AC_LANG_PROGRAM([
 				#include <sql.h>
 				#include <sqlext.h>
@@ -74,7 +74,7 @@
 			   missing symbols or can't link. */
 			SQLRETURN       retcode;
 			retcode = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, (SQLHENV*)0);
-			]),_libunixodbc_usable=yes,_libunixodbc_usable=no)
+			]),_cv_libunixodbc_usable=yes,_cv_libunixodbc_usable=no)
 		])
 
 		LIBS="${_save_unixodbc_libs}"
@@ -84,7 +84,7 @@
 		unset _save_unixodbc_ldflags
 		unset _save_unixodbc_cflags
 
-		if test "$_libunixodbc_usable" != "yes"; then
+		if test "$_cv_libunixodbc_usable" != "yes"; then
 			AC_MSG_ERROR([Can't use libodbc library])
 		fi
 
@@ -97,5 +97,5 @@
   AC_SUBST(UNIXODBC_LIBS)
 
   unset _libunixodbc_with
-  unset _libunixodbc_usable
+  unset _cv_libunixodbc_usable
 ])dnl