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W| S( s� Merge values from cffi config flags cfg2 to cf1
Example:
merge_flags({"libraries": ["one"]}, {"libraries": ["two"]})
{"libraries": ["one", "two"]}
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| | | f � � n | S( s5 Calls pkg-config and returns the output if found
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Usage
...
ffibuilder.set_source("_foo", pkgconfig = ["libfoo", "libbar >= 1.8.3"])
If pkg-config is installed on build machine, then arguments include_dirs,
library_dirs, libraries, define_macros, extra_compile_args and
extra_link_args are extended with an output of pkg-config for libfoo and
libbar.
Raises PkgConfigError in case the pkg-config call fails.
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