[MonoDevelop] Unable to install monodevelop-0.18.1 - can't find Mono.Addins

[Johann MacDonagh]

I'm trying to install MonoDevelop 0.18.1 on my Gentoo system (just via
source, not creating ebuilds).

The portage tree doesn't have an ebuild for Mono.Addins 0.3, so I got
the source and:
./configure
make
sudo make install

and now the libraries are in /usr/local/lib/mono/mono-addins

I then got the monodevelop sources and tried (as per the README):
$ ./configure --prefix=`pkg-config --variable=prefix mono`
--disable-update-desktopdb
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking how to create a ustar tar archive... gnutar
checking whether to enable maintainer-specific portions of Makefiles... no
checking for style of include used by make... GNU
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking dependency style of gcc... none
checking for intltool >= 0.25... 0.35.5 found
checking for perl... /usr/bin/perl
checking for XML::Parser... ok
checking for iconv... /usr/bin/iconv
checking for msgfmt... /usr/bin/msgfmt
checking for msgmerge... /usr/bin/msgmerge
checking for xgettext... /usr/bin/xgettext
checking for mono... /usr/bin/mono
checking for gmcs... /usr/bin/gmcs
checking for update-mime-database... /usr/bin/update-mime-database
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for UNMANAGED_DEPENDENCIES_MONO... yes
checking for UNMANAGED_DEPENDENCIES_MINT... no
checking for mono... /usr/bin/mono
checking for gmcs... /usr/bin/gmcs
checking for MONO_ADDINS... configure: error: Package requirements
(mono-addins >= 0.3) were not met:

No package 'mono-addins' found

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

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

Shouldn't the make install of the Mono.Addins source have added the
correct pkg-config metadata? How do I point monodevelop to use those
libraries, or should they have been installed somewhere else?

Thanks,
Johann