Description:
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Line 816 of gmagick.c needs to be wrapped in a if GMAGICK_LIB_MASK >= 1003007 statement, otherwise it will not be defined when compiling if the library version is less than 1003007.

Also see the header file php_gmagick.h line 186.

Test script:
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pecl install channel://pecl.php.net/gmagick-1.1.0RC3

Expected result:
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N/A

Actual result:
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/tmp/pear/temp/gmagick/gmagick.c:816: error: zim_gmagick_setcompressionquality undeclared here (not in a function)