|  | @@ -29,10 +29,10 @@
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				|  |  |  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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				|  |  |  
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				|  |  |  set -e
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				|  |  | -default_extension_dir=`php -i | grep extension_dir | sed 's/.*=> //g'`
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				|  |  | -if command -v brew >/dev/null && [ -d `brew --prefix`/opt/grpc-php ]; then
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				|  |  | +default_extension_dir=$(php -i | grep extension_dir | sed 's/.*=> //g')
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				|  |  | +if command -v brew >/dev/null && [ -d $(brew --prefix)/opt/grpc-php ]; then
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				|  |  |    # homebrew and the grpc-php formula are installed
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				|  |  | -  extension_dir="-d extension_dir="`brew --prefix`/opt/grpc-php
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				|  |  | +  extension_dir="-d extension_dir="$(brew --prefix)/opt/grpc-php
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				|  |  |  elif [ ! -f $default_extension_dir/grpc.so ]; then
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				|  |  |    # the grpc extension is not found in the default PHP extension dir
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				|  |  |    # try the source modules directory
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