[build] add to autogen.sh hint listing reqd pkgs
add hint to autogen.sh listing packages required for build
if ./autogen.sh fails
#!/bin/sh
# Run this to generate all the initial makefiles, etc.
+function errtrace {
+ echo 1>&2 \
+ "build requires autoconf automake libtool m4 pcre pcre-devel pkg-config"
+}
+
+trap errtrace ERR
+
set -e
if [ ! -f configure.ac -o ! -f COPYING ]; then
