Fix build system to remove hardcoded debugging flags.

--- allpathslg-52488/configure.ac
+++ allpathslg-52488/configure.ac
@@ -12,7 +12,7 @@
 AC_OPENMP
 AC_OPENMP_CHECK
 
-CXXFLAGS="$CXXFLAGS -std=c++11 -Wextra -Wall -Wsign-promo -Woverloaded-virtual -Wendif-labels -Wno-unused -Wno-deprecated -Wno-long-long -Wno-parentheses -Wno-unused-parameter -fno-nonansi-builtins -mieee-fp -fno-strict-aliasing -iquote . -ggdb -DNDEBUG"
+CXXFLAGS="$CXXFLAGS -std=c++11 -Wextra -Wall -Wsign-promo -Woverloaded-virtual -Wendif-labels -Wno-unused -Wno-deprecated -Wno-long-long -Wno-parentheses -Wno-unused-parameter -mieee-fp -fno-strict-aliasing -iquote . -DNDEBUG"
 
 OS_RELEASE="`uname -r`"
 AC_SUBST(CXXFLAGS)
--- allpathslg-52488/m4/broad.m4
+++ allpathslg-52488/m4/broad.m4
@@ -35,12 +35,14 @@
     OLD_CFLAGS=$CFLAGS
     CFLAGS="$OPENMP_CFLAGS $CFLAGS"
     AC_MSG_CHECKING([validity of OpenMP configuation.])
-    AC_LINK_IFELSE([#ifndef _OPENMP
+	AC_LINK_IFELSE([
+        AC_LANG_SOURCE([[
+	#ifndef _OPENMP
      choke me
     #endif
     #include <omp.h>
-    int main () { return omp_get_num_threads (); }],
-    [],
+    int main () { return omp_get_num_threads (); }
+    ]])],[],
     [AC_MSG_BROAD_FAIL([Your compiler must support OpenMP.])])
     CXXFLAGS=$OLD_CXXFLAGS
     CFLAGS=$OLD_CFLAGS