Change "head -1" to "sort q" as suggested for POSIX compatibility.

Author: bmomjian

configure

@@ -1629,7 +1629,7 @@ fi
 
 # Create compiler version string
 if test x"$GCC" = x"yes" ; then
-  cc_string="GCC `${CC} --version | head -1`"
+  cc_string="GCC `${CC} --version | sed q`"
 else
   cc_string=$CC
 fi

configure.in

@@ -297,7 +297,7 @@ AC_SUBST(GCC)
 
 # Create compiler version string
 if test x"$GCC" = x"yes" ; then
-  cc_string="GCC `${CC} --version | head -1`"
+  cc_string="GCC `${CC} --version | sed q`"
 else
   cc_string=$CC
 fi