Re: [PATCH] configure: add workaround for systems without zlib.pc

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+From: David Bremner <david@tethera.net>\r
+To: Tomi Ollila <tomi.ollila@iki.fi>, Felipe Contreras\r
+       <felipe.contreras@gmail.com>, notmuch@notmuchmail.org\r
+Subject: Re: [PATCH] configure: add workaround for systems without zlib.pc\r
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+References: <1399864172-28227-1-git-send-email-felipe.contreras@gmail.com>\r
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+\r
+Tomi Ollila <tomi.ollila@iki.fi> writes:\r
+\r
+>> +static const char *template =\r
+>> +   "prefix=/usr\n"\r
+>> +   "exec_prefix=${prefix}\n"\r
+>> +   "libdir=${exec_prefix}/lib\n"\r
+>> +   "\n"\r
+>> +   "Name: zlib\n"\r
+>> +   "Description: zlib compression library\n"\r
+>> +   "Version: %s\n"\r
+>> +   "Libs: -lz\n";\r
+>\r
+> The above is bit different what zlib.pc files have in e.g. Fedora 20 and\r
+> Ubuntu 14.04 machines: those have 'Requires: before Libs: (and Cflags:)'\r
+> But probably that is unnecessary (and just some sugar coating...?).\r
+>\r
+\r
+it seems consistent with the 'foo' example at\r
+\r
+   http://people.freedesktop.org/~dbn/pkg-config-guide.html#writing\r
+\r
+>\r
+> To be consistent what we do elsewhere:\r
+>\r
+>   PKG_CONFIG_PATH=${PKG_CONFIG_PATH:+$PKG_CONFIG_PATH:}compat &&\r
+>\r
+> i.e. don't add ':' in case $PKG_CONFIG_PATH is not defined or is empty string.\r
+\r
+What Tomi writes here sounds correct to me. I guess empty PKG_CONFIG_PATH is\r
+probably the most common case.\r
+\r
+d\r