--- /dev/null
+head no longer supports "-1" syntax
+
+Index: dtn-2.5.0/oasys/aclocal/gcc.ac
+===================================================================
+--- dtn-2.5.0.orig/oasys/aclocal/gcc.ac 2008-02-27 22:38:22.000000000 +0000
++++ dtn-2.5.0/oasys/aclocal/gcc.ac 2008-02-27 22:39:05.000000000 +0000
+@@ -83,13 +83,13 @@
+ dnl Figure out the version and set version-specific options
+ dnl
+ AC_CACHE_CHECK(for the version of the GNU C compiler, oasys_cv_prog_gccver, [
+- oasys_cv_prog_gccver=`$CC --version | head -1`
++ oasys_cv_prog_gccver=`$CC --version | head -n 1`
+ oasys_cv_prog_gccver=`echo $oasys_cv_prog_gccver | sed 's/.*gcc.*(GCC) //'`
+ oasys_cv_prog_gccver=`echo $oasys_cv_prog_gccver | sed 's/ .*//'`
+ ])
+
+ AC_CACHE_CHECK(for the version of the GNU C++ compiler, oasys_cv_prog_gxxver, [
+- oasys_cv_prog_gxxver=`$CXX --version | head -1`
++ oasys_cv_prog_gxxver=`$CXX --version | head -n 1`
+ oasys_cv_prog_gxxver=`echo $oasys_cv_prog_gxxver | sed 's/.*g++.*(GCC) //'`
+ oasys_cv_prog_gxxver=`echo $oasys_cv_prog_gxxver | sed 's/ .*//'`
+ ])