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-rw-r--r--Build/source/texk/web2c/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/Build/source/texk/web2c/configure.ac b/Build/source/texk/web2c/configure.ac
index 71d9d8647e6..aaf79e4b6e1 100644
--- a/Build/source/texk/web2c/configure.ac
+++ b/Build/source/texk/web2c/configure.ac
@@ -231,6 +231,7 @@ if test `(uname) 2>/dev/null` = aux; then
AC_CHECK_LIB([posix], [sigemptyset])
fi
+AC_C_CHAR_UNSIGNED
AC_CHECK_SIZEOF([int])
if test $ac_cv_sizeof_int -lt 4; then
AC_MSG_ERROR([Sorry, need `int' with at least 4 bytes.])