Conda gcc/g++ did not replace system (linux) gcc

I'm using a Linux system (in which I don't have sudo access) which already had gcc installed.

I have to run some software, which requires stuff like cmake, bison and flex, and I installed them with Anaconda.

Since the cmake version I need also required a more recent version of gcc (the one on the system is gcc 4.8?), I also installed this with Anaconda.

I installed: gcc_linux-64 and gxx_linux-64

However, when I try to compile my software, I always get errors from the cmake:

cmake: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by cmake)
cmake: /lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by cmake)
cmake: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by cmake)
cmake: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.22' not found (required by cmake)

However, as can be seen, even though I installed a new version of gcc and g++ with anaconda, cmake still fetches the libraries from the old system installation.

I tried deactivating and activating the environment again, restarting bash, but the behaviour is the same.

I also tried:

$ which gcc
/usr/bin/gcc

but when I do

$ printenv | grep CXX
CXXFLAGS=-fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -pipe
CXXFILT=/home/myuseraccount/bulk/anaconda3/bin/x86_64-conda_cos6-linux-gnu-c++filt
DEBUG_CXXFLAGS=-fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-all -fno-plt -Og -g -Wall -Wextra -fvar-tracking-assignments -pipe
CXX=/home/myuseraccount/bulk/anaconda3/bin/x86_64-conda_cos6-linux-gnu-c++
$ printenv | grep GCC
GCC_NM=/home/myuseraccount/bulk/anaconda3/bin/x86_64-conda_cos6-linux-gnu-gcc-nm
GCC_RANLIB=/home/myuseraccount/bulk/anaconda3/bin/x86_64-conda_cos6-linux-gnu-gcc-ranlib
GCC=/home/myuseraccount/bulk/anaconda3/bin/x86_64-conda_cos6-linux-gnu-gcc
GCC_AR=/home/myuseraccount/bulk/anaconda3/bin/x86_64-conda_cos6-linux-gnu-gcc-ar

... which appears to be right?

Any help appreciated!

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