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-rw-r--r--libraries/base/configure.ac2
1 files changed, 2 insertions, 0 deletions
diff --git a/libraries/base/configure.ac b/libraries/base/configure.ac
index e034549476..6fc96d92f4 100644
--- a/libraries/base/configure.ac
+++ b/libraries/base/configure.ac
@@ -189,6 +189,8 @@ FP_CHECK_CONSTS([SIGINT], [
dnl ** can we open files in binary mode?
FP_CHECK_CONST([O_BINARY], [#include <fcntl.h>], [0])
+FP_CHECK_ENVIRON
+
# We don't use iconv or libcharset on Windows, but if configure finds
# them then it can cause problems. So we don't even try looking if
# we are on Windows.