png.c: In function `ReadOnePNGImage':
png.c:1712: warning: implicit declaration of function `png_access_version'
png.c:1721: error: `png_ptr' undeclared (first use in this function)
png.c:1721: error: (Each undeclared identifier is reported only once
png.c:1721: error: for each function it appears in.)
*** Error code 1
Stop in /usr/ports/graphics/GraphicsMagick/work/GraphicsMagick-1.1.6/coders.
*** Error code 1
Stop in /usr/ports/graphics/GraphicsMagick/work/GraphicsMagick-1.1.6.
*** Error code 1
Stop in /usr/ports/graphics/GraphicsMagick.
*** Error code 1
Stop in /usr/ports/graphics/pecl-imagick.
*** Error code 1