gcc libs are not found

[glenntanner3]

Although the gcc libs are provided, they are not found.
arch linux 5.15.7-arch1-1 x86_64 GNU/Linux

$ ./build.sh
...
Please choose a mode(1-7): 1
...
/home/glennt/github/BPI-R64-bsp-4.19/toolchains/buildroot-gcc492_arm/usr/bin/../libexec/gcc/arm-buildroot-linux-uclibcgnueabi/4.9.2/cc1: error while loading shared libraries: libmpfr.so.4: cannot open shared object file: No such file or directory
$ ls /usr/lib/libmpfr.so
libmpfr.so        libmpfr.so.6      libmpfr.so.6.1.0
$ find -name libmpfr*
./toolchains/buildroot-gcc492_arm/usr/lib/libmpfr.so
./toolchains/buildroot-gcc492_arm/usr/lib/libmpfr.so.4.1.2
./toolchains/buildroot-gcc492_arm/usr/lib/libmpfr.la
./toolchains/buildroot-gcc492_arm/usr/lib/libmpfr.so.4