diff --git a/scripts/configure.in b/scripts/configure.in
index b3b33510..ca3e2c12 100644
--- a/scripts/configure.in
+++ b/scripts/configure.in
@@ -125,6 +125,8 @@ AC_CHECK_SIZEOF([unsigned long long], 8)
 
 dnl Check byte arrangement for doubleint routines
 AC_C_BIGENDIAN
+AC_C_INLINE
+AC_C_RESTRICT
 
 dnl Check for required header files
 AC_HEADER_STDC