warn if autogen isn't installed

Signed-off-by: Jason Cooper <jason@lakedaemon.net>

configure.ac

@@ -17,6 +17,14 @@ if [ test "$GCC" = "yes" ];then
 fi
 AC_PATH_PROG(CTAGS, ctags, /bin/true)
 AC_PATH_PROG(CSCOPE, cscope, /bin/true)
+AC_PATH_PROG(AUTOGEN, autogen, /bin/true)
+
+if test x"$AUTOGEN" = "x/bin/true"; then
+	AC_MSG_WARN([[
+***
+*** autogen not found.  We will not build manpages.
+*** ]])
+fi
 
 AC_CHECK_SIZEOF([unsigned long])
 AC_C_BIGENDIAN

doc/Makefile.am

@@ -4,5 +4,5 @@ dist_man_MANS = ocserv.1
 
 ocserv.1: ../src/ocserv-args.def
 	-sed 's/@subheading \(.*\)/@*\n@var{\1}\n@*/' $< > "$<".tmp && \
-	autogen -DMAN_SECTION=1 -Tagman-cmd.tpl "$<".tmp && \
+	@AUTOGEN@ -DMAN_SECTION=1 -Tagman-cmd.tpl "$<".tmp && \
 	rm -f "$<".tmp

src/Makefile.am

@@ -28,4 +28,4 @@ ocserv_LDADD += $(LIBGNUTLS_LIBS) $(GDBM_LIBS) $(PAM_LIBS) $(LIBUTIL) \
 	$(LIBSECCOMP) $(LIBWRAP)
 
 ocserv-args.c ocserv-args.h: $(srcdir)/ocserv-args.def
-	-autogen $<
+	-@AUTOGEN@ $<