Add to PKG_CONFIG_PATH, instead of replacing it.

This is a better solution as it takes into account paths that have
already been set up by users.

Potentially fixes: #70

2 files changed, 4 insertions, 4 deletions

diff --git a/README.org b/README.org
index 594e975..d6bb969 100644
--- a/README.org
+++ b/README.org
@@ -92,9 +92,9 @@ Although macOS is not officially supported, it has been reported that ~pdf-tools
   $ brew install poppler automake
 #+END_SRC
 
-You will also have to help ~pkg-config~ find some libraries by setting ~PKG_CONFIG_PATH~, e.g.
+You will also have to help ~pkg-config~ find some libraries by setting ~PKG_CONFIG_PATH~. ~brew~ will show you which paths need to be added to ~PKG_CONFIG_PATH~ during the installation process. Make sure you export the paths to the env variable, eg:
 #+BEGIN_SRC sh
-  $ export PKG_CONFIG_PATH=/usr/local/Cellar/zlib/1.2.8/lib/pkgconfig:/usr/local/lib/pkgconfig:/opt/X11/lib/pkgconfig
+  $ export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:$(brew --prefix libffi)/lib/pkgconfig/:/usr/local/Cellar/zlib/1.2.8/lib/pkgconfig:/usr/local/lib/pkgconfig:/opt/X11/lib/pkgconfig"
 #+END_SRC
 or likewise within Emacs using ~setenv~.
 
diff --git a/server/autobuild b/server/autobuild
index c738f59..f0b18f3 100755
--- a/server/autobuild
+++ b/server/autobuild
@@ -366,9 +366,9 @@ os_macos() {
         PKGARGS=install
         PACKAGES="pkg-config poppler automake"
         PKG_INSTALL_AS_ROOT=
-        # homebrew install libffi as keg-only, meaning we need to set
+        # brew installs libffi as keg-only, meaning we need to set
         # PKG_CONFIG_PATH manually so configure can find it
-        export PKG_CONFIG_PATH="$(brew --prefix libffi)/lib/pkgconfig/"
+        export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:$(brew --prefix libffi)/lib/pkgconfig/"
     elif which port >/dev/null 2>&1; then
         PKGCMD=port
         PKGARGS=install