updated libquantum 0.2.1 source files

configure.in

@@ -1,5 +1,5 @@
 # Process this file with autoconf to produce a configure script.
-AC_INIT([libquantum], [0.2.0], [libquantum@enyo.de])
+AC_INIT([libquantum], [0.2.1], [libquantum@enyo.de])
 AC_CONFIG_SRCDIR([classic.c])
 AC_CONFIG_HEADER([config.h])
 
@@ -12,7 +12,6 @@ AC_PROG_INSTALL
 AC_PROG_LIBTOOL
 
 # Checks for libraries.
-# FIXME: Replace `main' with a function in `-lm':
 AC_CHECK_LIB([m], [sqrt])
 
 # Checks for header files.
@@ -72,8 +71,22 @@ then
 fi
 AC_MSG_RESULT($I)
 
+# Substitute fields in quantum.h.in
 AC_SUBST(MU_TYPE)
 AC_SUBST(CF_TYPE)
 
+# Profiling check
+AC_ARG_ENABLE(profiling, 
+	[  --enable-profiling      compile with profiling support],
+	[CFLAGS="$CFLAGS -pg"], 
+	[])
+
+# Enable -Wall for gcc
+if test $CC = "gcc"
+then
+	CFLAGS="$CFLAGS -Wall"
+fi
+
+# Write the output files
 AC_CONFIG_FILES([Makefile quantum.h])
-AC_OUTPUT
+AC_OUTPUT