First working (?) Makefile.arch

Makefile.arch.in

+CASENAME = @CASENAME@
+
+CC       = @CC@
+CPPFLAGS = @CPPFLAGS@ @DEFS@
+LDFLAGS  = @LDFLAGS@
+LIBS     = @LIBS@
+
+F77      = @F77@
+FFLAGS   = @FFLAGS@ @FCFLAGS_f@ $(subst -D, @FC_DEFINE@, @DEFS@)
+FLIBS    = @FLIBS@

configure.ac

@@ -342,9 +342,7 @@ fi
 # TWEAK .usr file
 ###############################################################################
 
-AC_CHECK_FILE([$CASENAME.usr], , 
-  AC_MSG_ERROR([could not find $CASENAME.usr in current directory. Ensure that \$CASENAME is correctly set.])
-)
+AC_CHECK_FILE([$CASENAME.usr], , AC_MSG_ERROR([could not find $CASENAME.usr in current directory. Ensure that CASENAME is correctly set.]))
 AC_MSG_NOTICE([tweaking $CASENAME.usr])
 
 rm -f $CASENAME.f
@@ -426,4 +424,5 @@ fi
 # ALL DONE!
 ###############################################################################
 
+AC_CONFIG_FILES([Makefile.arch:Makefile.arch.in])
 AC_OUTPUT