devel/glib20 depends on PCRE >= 7.2 but does not specify version in Makefile

[Cian Hughes]

Hey guys,
I have found a problem with the glib20 port while installing it on a  
system with pcre version 7.0.
I'm not sure what the easiest way to specify the required version is  
but:

LIB_DEPENDS+=	pcre.0:${PORTSDIR}/devel/pcre

obviously can't specify a specific version of PCRE.

===>  Configuring for glib-2.16.1_2
.....
.....
checking for PCRE... configure: error: Package requirements (libpcre  
 >= 7.2) were not met:

Requested 'libpcre >= 7.2' but version of libpcre is 7.0

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables PCRE_CFLAGS
and PCRE_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

===>  Script "configure" failed unexpectedly.
Best Regards,
~Cian Hughes
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