If you still face the issue, check your compiler command for -I flags that might be overriding default include paths. Running gcc -v can show where it’s searching for headers.

sudo yum install glibc-devel # or sudo dnf install glibc-devel Ensure full C library development headers are installed:

Common root causes include:

sudo apt update sudo apt install libc6-dev On RHEL/CentOS/Fedora: