diff --git a/configure.ac b/configure.ac
index 82506ffe163577ffc524952834c377fc76855d80..e5c715637b09444ff5d247e200a6a42ea6a23fd3 100755
--- a/configure.ac
+++ b/configure.ac
@@ -257,21 +257,17 @@ AC_SUBST(BOOST_CPPFLAGS)
 
 ###### Checking for OpenBLAS
 
-AX_BLAS([],[echo "blas not found"
-                    exit 204])
+AX_BLAS([],[])
 
-AX_LAPACK([],[echo "lapack not found"
-                    exit 204])
+AX_LAPACK([],[])
 
 ###### Checking for SUITESPARSE
 
-AX_SUITESPARSE([],[echo "suitesparse not found"
-                    exit 205])
+AX_SUITESPARSE([],[])
 
 ###### Checking for EIGEN
 
-AX_EIGEN([],[echo "eigen not found"
-                    exit 206])
+AX_EIGEN([],[])
 
 ###### Checking for compiler flags -fext-numeric-literals