diff --git a/configure.ac b/configure.ac
index bb0c4879f694639169eb5f636ceb7cefc5dbbd05..c2d15d0ac1ab55a80e5923853f015bbfc1c2156d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,7 +52,7 @@ dnl set template depth and hidden visibility
 [CXXFLAGS="${CXXFLAGS} -ftemplate-depth-150"]
 
 dnl disable deprecation warning, to silence some harmless BGL-related warnings
-[CXXFLAGS="${CXXFLAGS} -Wno-deprecated"]
+[CXXFLAGS="${CXXFLAGS} -Wno-deprecated -Wno-unknown-pragmas"]
 
 AC_MSG_CHECKING(whether to enable function inlining...)