On 01/27/2014 11:39 AM, Eric Blake wrote: > The autoconf manual doesn't mention any examples of actually > using m4_pattern_forbid. Yet this is the perfect macro for > avoiding the all-too-common failure mode of configure dying with: > > checking if libxml2 is present... ./configure: line 11586: syntax > error > near unexpected token `LIBXML2,' > ./configure: line 11586: `PKG_CHECK_MODULES(LIBXML2, libxml-2.0>= > 2.6.19,' > > for developers that forgot to install pkg-config. While we don't > necessarily advertise the use of PKG_CHECK_MODULES, it is a > common enough situation that the manual should make it easier to > help developers learn about missing third-party macros. > > Based on a mailing list report by Daniel Pocock: > http://lists.gnu.org/archive/html/autoconf/2014-01/msg00030.html > > * doc/autoconf.texi (Forbidden Patterns): Add examples. > > Signed-off-by: Eric Blake <eblake@xxxxxxxxxx> > --- > > No wonder it took us a couple of iterations to give you the > right advice - we didn't have good documentation. This patch > should give us something to point the next person to, when > encountering a similar situation. > No comments, so I pushed this. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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