Make the build work with speech-dispatcher >= 0.8.

build/linux/system.gyp

Index: build/linux/system.gyp
diff --git a/build/linux/system.gyp b/build/linux/system.gyp
index d9e553d7ddea8935317a9234238560295414765c..1f34fbdd860f4f4833a5e493d5f81979cf072a59 100644
--- a/build/linux/system.gyp
+++ b/build/linux/system.gyp
@@ -480,6 +480,15 @@
             'output_h': '<(SHARED_INTERMEDIATE_DIR)/library_loaders/libspeechd.h',
             'output_cc': '<(INTERMEDIATE_DIR)/libspeechd_loader.cc',
             'generator': '../../tools/generate_library_loader/generate_library_loader.py',
+
+            # speech-dispatcher >= 0.8 ships a .pc file and installs
+            # libspeechd.h into speech-dispatcher/libspeechd.h, whereas
+            # speech-dispatcher < 0.7 does not install a .pc file and puts
+            # libspeechd.h in the top-level include directory.
+            # Take both cases into account by assuming that if the .pc file
+            # exists we have speech-dispatcher >= 0.8 and the header is in
+            # speech-dispatcher/.
+            'header_prefix': '<!(<(pkg-config) --exists speech-dispatcher && echo "speech-dispatcher/" || echo)',

[Paweł Hajdan Jr., 2013/04/16 19:23:42]

I'm not really happy about this. Auto-detection for compile-time things is sort
of fine (don't confuse with automagic dependencies which are bad,
http://www.gentoo.org/proj/en/qa/automagic.xml), but it may encourage actual
automagic dependencies in Chromium (I've seen that happen, and the pkg-config
logic was looking very similar).

Please rather use --bundled-header option for generate_library_loader.py . You
can find usage examples in this file (system.gyp).

           },
           'action_name': 'generate_libspeechd_loader',
           'inputs': [
@@ -494,7 +503,7 @@
                      '--name', 'LibSpeechdLoader',
                      '--output-h', '<(output_h)',
                      '--output-cc', '<(output_cc)',
-                     '--header', '<libspeechd.h>',
+                     '--header', '<<(header_prefix)libspeechd.h>',
                      '--link-directly=<(linux_link_libspeechd)',
                      'spd_open',
                      'spd_say',