GCC cross-compiler for DOS gives a bunch of linker errors for "Hello world!" in C

I've tried to configure GCC 9.3.0 to produce executable files for DOS. However, for a simple "Hello world!" program in C, it outputs:

/home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/bin/ld: /home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/lib/libc.a(crt1.o):crt1.c:(.text+0xd6): undefined reference to `_environ'/home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/bin/ld: /home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/lib/libc.a(crt1.o):crt1.c:(.text+0x10b): undefined reference to `_environ'/home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/bin/ld: /home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/lib/libc.a(crt1.o):crt1.c:(.text+0x131): undefined reference to `_environ'/home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/bin/ld: /home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/lib/libc.a(crt1.o):crt1.c:(.text+0x141): undefined reference to `_environ'/home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/bin/ld: /home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/lib/libc.a(crt1.o):crt1.c:(.text+0x3d4): undefined reference to `_environ'/home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/bin/ld: /home/teo.samarzija/djgpp-9.3.0/lib/gcc/djgpp/9.3.0/../../../../djgpp/lib/libc.a(getenv.o):getenv.c:(.text+0x4): more undefined references to `_environ' followcollect2: error: ld returned 1 exit status

djgpp-gcc -v outputs:

Using built-in specs.COLLECT_GCC=djgpp-gccCOLLECT_LTO_WRAPPER=/home/teo.samarzija/djgpp-9.3.0/libexec/gcc/djgpp/9.3.0/lto-wrapperTarget: djgppConfigured with: ../gcc-9.3.0/configure --target=djgpp --prefix=/home/teo.samarzija/djgpp-9.3.0 --enable-languages=c,c++,objc,ada,fortran,goThread model: singlegcc version 9.3.0 (GCC) 

I've also compiled the newest version of the GNU linker and GNU Assembler, they output as their versions:

GNU ld (GNU Binutils) 2.34Copyright (C) 2020 Free Software Foundation, Inc.This program is free software; you may redistribute it under the terms ofthe GNU General Public License version 3 or (at your option) a later version.This program has absolutely no warranty.

and

GNU assembler (GNU Binutils) 2.34Copyright (C) 2020 Free Software Foundation, Inc.This program is free software; you may redistribute it under the terms ofthe GNU General Public License version 3 or later.This program has absolutely no warranty.This assembler was configured for a target of `djgpp'.

Any idea what I am doing wrong? Have GCC or GAS or GLD stopped supporting DOS some time in the past? I suppose not, because they compile for DOS as a target without warning about that.