adding the built-in OpenMP check in addition to extra libraries needed on clang++

Author: guilhermesena1

configure.ac

@@ -33,6 +33,7 @@ AC_PROG_RANLIB
 
 AC_CONFIG_SUBDIRS([src/smithlab_cpp])
 
+AC_OPENMP([C++])
 AX_OPENMP([], [AC_MSG_FAILURE([OpenMP must be installed to build abismal])]) dnl make sure we have openmp for multi-core in abismal
 
 dnl check for the Zlib library