Man page - fcpatternaddweak(3)

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Package: libfontconfig-doc
apt-get install libfontconfig-doc

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FcPatternAddWeak - Add a value to a pattern with weak binding

#include <fontconfig/fontconfig.h>

FcBool FcPatternAddWeak (FcPattern * p , const char * object , FcValue value , FcBool append );

FcPatternAddWeak is essentially the same as FcPatternAdd except that any values added to the list have binding weak instead of strong .