I am trying to install glibc-2.12.2 because Haskell-stack specifically needs 2.12 version.
ldd --version
ldd (GNU libc) 2.26
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.
The error is -
rajkumar@localhost:~/Downloads/glibc-2.12.2/build-tree> ../configure
configure: loading site script /usr/share/site/x86_64-unknown-linux-gnu
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking for /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld... /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld
checking version of /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld... 2.29.0.20170830, ok
checking for pwd... /usr/bin/pwd
checking for gcc... gcc
checking version of gcc... 7.2.1, bad
checking for gnumake... no
checking for gmake... gmake
checking version of gmake... 4.2.1, bad
checking for gnumsgfmt... no
checking for gmsgfmt... no
checking for msgfmt... msgfmt
checking version of msgfmt... 0.19.8.1, ok
checking for makeinfo... no
checking for sed... sed
checking version of sed... v. ?.??, bad
checking for autoconf... no
configure: error:
*** These critical programs are missing or too old: gcc make
*** Check the INSTALL file for required versions.
But I have gcc and make already installed.
rajkumar@localhost:~/Downloads/glibc-2.12.2/build-tree> sudo zypper install make
Loading repository data...
Reading installed packages...
'make' is already installed.
No update candidate for 'make-4.2.1-2.1.x86_64'. The highest available version is already installed.
Resolving package dependencies...
Nothing to do.
rajkumar@localhost:~/Downloads/glibc-2.12.2/build-tree> sudo zypper install gcc
Loading repository data...
Reading installed packages...
'gcc' is already installed.
No update candidate for 'gcc-7-2.4.x86_64'. The highest available version is already installed.
Resolving package dependencies...
Nothing to do.
I already have glibc 2.26 installed. How can I downgrade the version to 2.12 on opensuse.
I am trying to install glibc-2.12.2 because Haskell-stack specifically needs 2.12 version.
This is exceedingly unlikely to be true: GLIBC is backwards-compatible (older programs continue to work on newer GLIBC versions).
I already have glibc 2.26 installed. How can I downgrade the version to 2.12 on opensuse.
If you succeed, you will render your system unbootable. You really don't want to do this.
Instead you should describe your actual problem.
P.S. Your gcc is certainly not too old. Rather, your GLIBC-2.12 configure is too old to understand that such a new gcc is new enough.