If not defined then return a meaningful error at runtime.
This makes it possible to build and use the image package - except the in-memory JPEG compress and decompress operations - on systems that ship with old libjpeg or libjpeg-turbo like Centos 6.x (#152) or Amazon Linux AMI (libjpeg-turbo 1.2.90 at the time of writing).
Later on we can also decide to write replacement functions if we really want to add support for these operations (see this).
soumith
commented
8 years ago
If not defined then return a meaningful error at runtime.
This makes it possible to build and use the image package - except the in-memory JPEG compress and decompress operations - on systems that ship with old libjpeg or libjpeg-turbo like Centos 6.x (#152) or Amazon Linux AMI (libjpeg-turbo 1.2.90 at the time of writing).
Later on we can also decide to write replacement functions if we really want to add support for these operations (see this).