Building ruby version 3.1.2:configure: error: something wrong with CFLAGS

[lhw828]

Building ruby version 3.1.2
checking for ruby... false
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
checking for ld... ld
checking for gcc-ar... gcc-ar
checking for g++... g++
checking for gcc-nm... gcc-nm
checking for gcc-ranlib... gcc-ranlib
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for gcc option to accept ISO C99... none needed
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking how to run the C preprocessor... cpp
checking for ranlib... (cached) gcc-ranlib
checking for gas... no
checking for as... as
checking for gobjcopy... no
checking for objcopy... objcopy
checking for gobjdump... no
checking for objdump... objdump
checking for gstrip... no
checking for strip... strip
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking minix/config.h usability... no
checking minix/config.h presence... no
checking for minix/config.h... no
checking whether it is safe to define EXTENSIONS... yes
checking whether the linker is GNU ld... yes
checking whether cpp accepts -o... yes
checking for gcc... /var/lib/lunar/compilers/gcc
checking for gcc-ar flags... rcD
checking whether ln -s works... yes
checking whether make sets $(MAKE)... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for dtrace... no
checking for dot... dot
checking for doxygen... doxygen
checking for pkg-config... pkg-config
checking whether it is Android... no
checking for cd using physical directory... cd -P
checking whether CFLAGS is valid... no
configure: error: something wrong with CFLAGS=" -O2 -march=x86-64 -pipe -Wp,-D_FORTIFY_SOURCE=2 "