Allow custom PKG_CONFIG_PATH

[TibboddiT]

To build miracle, I first build mir locally because I'm not an Ubuntu user and mir libs packaged with my system are too old (and I generally prefer build everything myself).

I therefore need to customize PKG_CONFIG_PATH so that the local mir libs can be found.

In the CmakeLists.txt provided there is this line:

set(ENV{PKG_CONFIG_PATH} "/usr/local/lib/pkgconfig/")

Currently I manually replace this line to have a fully working build phase:

-set(ENV{PKG_CONFIG_PATH} "/usr/local/lib/pkgconfig/")
+set(ENV{PKG_CONFIG_PATH} "$ENV{PKG_CONFIG_PATH}:/usr/local/lib/pkgconfig/")

and I export a custom PKG_CONFIG_PATH before building:

export PKG_CONFIG_PATH="${BASE_DIR}/mir/install/lib/pkgconfig/:$PKG_CONFIG_PATH"
export LD_LIBRARY_PATH="${BASE_DIR}/mir/install/lib:${LD_LIBRARY_PATH}"

(BASE_DIR/mir/install being the install dir of the local mir build)

I'm not a CMake specialist, so I was wondering: is there a way of using a local mir build without modifying the miracle-wm upstream files ?

If not, and if the fix I currently use is acceptable, I can make a PR.

[mattkae]

Hiya @TibboddiT 👋
Thanks for filing the bug. I think that I would prefer a cmake build option instead if you'd like to take a try at it. An example is the SNAP_BUILD option that you can find here.

I would definitely appreciate if you opened the PR for this one 😄

[TibboddiT]

See #198 😉