First. The save-for-web code is old, best I find is from 2008 for Gimp 2.6
then
It looks like you do not have the necessary 'dev' packages installed.
It does compile in ubuntu 16.04 with the dev packages from the otto-kesselgulasch gimp-edge PPA
autogen.sh complains about 'too new versions' but ./configure then make produces a file. Many warnings on the way. File is attached mainly for interest.
Remember to unzip it.
As mentioned earlier Gimp 2.9.x has a much different format for PNG. So the realistically there is only JPG output.
screenshot + error messages: https://i.imgur.com/IEqjvHx.jpg
One of the reasons for using save-for-web is the indication of file size.
You get this in regular Gimp anyway for JPG if Show preview in image window is enabled. Changing quality and Subsampling gives an estimate of file size. So really save-for-web is not needed.
screenshot: https://i.imgur.com/Cvxz9eO.jpg
If you really want webexport for Gimp 2.9.x then you will need to correct the code. More than I can do
then
It looks like you do not have the necessary 'dev' packages installed.
It does compile in ubuntu 16.04 with the dev packages from the otto-kesselgulasch gimp-edge PPA
autogen.sh complains about 'too new versions' but ./configure then make produces a file. Many warnings on the way. File is attached mainly for interest.
Remember to unzip it.
As mentioned earlier Gimp 2.9.x has a much different format for PNG. So the realistically there is only JPG output.
screenshot + error messages: https://i.imgur.com/IEqjvHx.jpg
One of the reasons for using save-for-web is the indication of file size.
You get this in regular Gimp anyway for JPG if Show preview in image window is enabled. Changing quality and Subsampling gives an estimate of file size. So really save-for-web is not needed.
screenshot: https://i.imgur.com/Cvxz9eO.jpg
If you really want webexport for Gimp 2.9.x then you will need to correct the code. More than I can do