perhaps this helps
I have been configuring a virtual machine, and choose an old OS, scientific linux, but needed a more recent gcc compiler, so downloaded all the required stuff, and then started gcc, of course using the online recipe, having had some 'experience' building gcc twenty years ago. All went well, until during a check, the same error, that cc1 cannot find the libisl lib, so was stuck. It seems to be, - from scouring the net - happening quite alot, so what was wrong? It had to be something in the environment, but what? After cheking this and that, I finally defined LD_LIBRARY_PATH=/lib (where a soft link to the lib was) and Hallo! It worked. Make is happily chugging away further and so, this may help in other cases.
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