unix/configure.ac | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index f62f5d4..d9a3750 100644
--- a/configure.ac
+++ b/configure.ac
@@ -335,10 +335,15 @@ fi
 AC_DEFINE([USE_OFFICIAL_BOOST], [], [Use the official Boost libraries.])
 
 # Intel Math Kernel library
-pov_save_ldflags="$LDFLAGS"
-test x"$with_libmkl" != x"" && LDFLAGS="-L$with_libmkl $LDFLAGS"
-AC_CHECK_LIB([mkl], [sin]) 
-test x"ac_cv_lib_mkl_sin" = x"no" && LDFLAGS="$pov_save_ldflags"
+AS_IF([test x"$with_libmkl" != x"no"], [
+  pov_save_ldflags="$LDFLAGS"
+  AS_IF([test x"$with_libmkl" != x"yes"], [
+    LDFLAGS="-L$with_libmkl $LDFLAGS"
+  ])
+  AC_CHECK_LIB([mkl], [sin], [], [
+	AC_MSG_ERROR([Cannot find working mkl library])
+  ])
+])
 
 # libm
 AC_CHECK_LIB([m], [sin])