--- configure.ac
+++ configure.ac
@@ -2854,7 +2854,7 @@
     dnl the LLVM library propagated in the Libs.private of the respective .pc
     dnl file which ensures complete dependency information when statically
     dnl linking.
-    if test "x$enable_glx" == xgallium-xlib; then
+    if test "x$enable_glx" = xgallium-xlib; then
         GL_PC_LIB_PRIV="$GL_PC_LIB_PRIV $LLVM_LIBS"
     fi
     if test "x$enable_gallium_osmesa" = xyes; then