Failed building wheel for gmpy2

[M0dred]

Failed building wheel for gmpy2
Running setup.py clean for gmpy2
Failed to build gmpy2
Installing collected packages: gmpy2, robot-detect
Running setup.py install for gmpy2 ... error
Complete output from command /usr/bin/python3 -u -c "import setuptools, tokenize;file='/tmp/pip-install-kh5vvxll/gmpy2/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /tmp/pip-record-5kh81p28/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_ext
building 'gmpy2' extension
creating build
creating build/temp.linux-i686-3.7
creating build/temp.linux-i686-3.7/src
i686-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DWITHMPFR -DWITHMPC -I/usr/include/python3.7m -c src/gmpy2.c -o build/temp.linux-i686-3.7/src/gmpy2.o
In file included from src/gmpy2.c:426:
src/gmpy.h:252:12: fatal error: mpfr.h: No such file or directory
252 | # include "mpfr.h"
| ^~~~~~~~
compilation terminated.
error: command 'i686-linux-gnu-gcc' failed with exit status 1

----------------------------------------

Command "/usr/bin/python3 -u -c "import setuptools, tokenize;file='/tmp/pip-install-kh5vvxll/gmpy2/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /tmp/pip-record-5kh81p28/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-install-kh5vvxll/gmpy2/

[cy1337]

Please see if the solution from this thread works for you: https://stackoverflow.com/a/50554366

[Reelix]

I had the same error on an aarch64 based system.

sudo apt install libmpc-dev

Fixed it for me.