added a 'html' target that builds HTML versions from the man page sources.

It requires 'gnroff' and 'man2html' for now. 'make html' will be invoked by
the 'maketgz' script and the HTML files are included in release archives.

docs/Makefile.am

@@ -28,8 +28,45 @@ man_MANS = \
 	curl_global_cleanup.3 \
 	libcurl.3
 
+SUBDIRS = examples
+
+HTMLPAGES = \
+	curl.html \
+	curl-config.html \
+	curl_easy_cleanup.html \
+	curl_easy_getinfo.html \
+	curl_easy_init.html \
+	curl_easy_perform.html \
+	curl_easy_setopt.html \
+	curl_formparse.html \
+	curl_formfree.html \
+	curl_getdate.html \
+	curl_getenv.html \
+	curl_slist_append.html \
+	curl_slist_free_all.html \
+	curl_version.html \
+	curl_escape.html \
+	curl_unescape.html \
+	curl_strequal.html \
+	curl_strnequal.html \
+	curl_mprintf.html \
+	curl_global_init.html \
+	curl_global_cleanup.html \
+	libcurl.html
+
 EXTRA_DIST = $(man_MANS) \
 	MANUAL BUGS CONTRIBUTE FAQ FEATURES INTERNALS \
-	LIBCURL README.win32 RESOURCES TODO TheArtOfHttpScripting THANKS
+	LIBCURL README.win32 RESOURCES TODO TheArtOfHttpScripting THANKS \
+	$(HTMLPAGES)
 
-SUBDIRS = examples
+MAN2HTML= gnroff -man $< | man2html >$@
+
+SUFFIXES += .1 .3 .html
+
+html: $(HTMLPAGES)
+
+.3.html:
+	$(MAN2HTML)
+
+.1.html:
+	$(MAN2HTML)