checking OpenSSL dir for FTP... no
checking for GD support... yes
checking for the location of libjpeg... no
checking for the location of libpng... no
checking for the location of libXpm... no
checking for FreeType 1.x support... no
checking for FreeType 2... no
checking for T1lib support... no
checking whether to enable truetype string function in GD... yes
checking whether to enable JIS-mapped Japanese font support in GD... no
checking for fabsf... yes
checking for floorf... yes
If configure fails try --with-jpeg-dir=<DIR>
configure: error: libpng.(a|so) not found.
make: *** 没有指明目标并且找不到 makefile。 停止。