*geany.pc* is installed by Geany. If you built Geany from source, it'll likely be installed to `/usr/local/lib/pkgconfig`. If your system doesn't use this path for looking up pkg-config files by default, alter the `PKG_CONFIG_PATH` variable before running Geany-Plugin's configure script: `export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH"`, then `./configure`. It should also allow `pkg-config --modversion geany` to find Geany and show you the installed version number.
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