This could be a duplicate, not sure. I have almost been able to install GNU-mp (for use with GMP-ecm which will probably be another saga to install on windows but that is for later) on windows 10 but not quite. I am using the version 6.2.1 and cygwin bash.exe with packages gcccore, gcc-g++, m4, make, cmake, bash added to default install, and upon executing ./configure from the gmp directory, here is what I get:
./configure: line 514: sed: command not found
./configure: line 513: expr: command not found
./configure: line 514: sed: command not found
./configure: line 528: sed: command not found
: error: cannot create .lineno; rerun with a POSIX shell
This output here comes up no matter what arguments I put after ./configure it seems. and whether I run bash.exe in powershell or cmd I get the same output. I am not great with github and compiling and all so I may be doing something obviously wrong. So yeah, close but not quite I guess. Anyone know what I can do about it? I havent seen this issue posted anywhere before.