Configure script OV_ECTL_COUPLING_SET checking error
Configure script for vorbistool 1.4.0 is broken in some cases. Checking OV_ECTL_COUPLING_SET results in error Vorbis >= 1.3.0 required. This occurs on systems where shared library search paths is not properly defined and the configure script was manually passed --with-ogg and -with-vorbis options with the proper paths to where the libraries are installed
The reason for this error may have been that compile variables $CFLAGS and $LIBS were set to default when they should have been set to include the $VORBIS_CFLAGS and $VORBIS_LIBS causing compiler failure to find include file vorbis/vorbisenc.h.