phoe@phoebox:/tmp/lzma-9.22/C/Util/Lzma
$ make -f makefile.gcc
g++ -c -O2 -Wall -D_7ZIP_ST LzmaUtil.c
LzmaUtil.c: In function ‘SRes Decode2(CLzmaDec*, ISeqOutStream*, ISeqInStream*, UInt64)’:
LzmaUtil.c:95:39: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
       if (res != SZ_OK || thereIsSize && unpackSize == 0)
                           ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
g++ -c -O2 -Wall -D_7ZIP_ST ../../Alloc.c
g++ -c -O2 -Wall -D_7ZIP_ST ../../LzFind.c
g++ -c -O2 -Wall -D_7ZIP_ST ../../LzmaDec.c
g++ -c -O2 -Wall -D_7ZIP_ST ../../LzmaEnc.c
../../LzmaEnc.c: In function ‘SRes LzmaEnc_Alloc(CLzmaEnc*, UInt32, ISzAlloc*, ISzAlloc*)’:
../../LzmaEnc.c:1908:8: warning: variable ‘btMode’ set but not used [-Wunused-but-set-variable]
   Bool btMode;
        ^~~~~~
g++ -c -O2 -Wall -D_7ZIP_ST ../../7zFile.c
g++ -c -O2 -Wall -D_7ZIP_ST ../../7zStream.c
g++ -o lzma  LzmaUtil.o Alloc.o LzFind.o LzmaDec.o LzmaEnc.o 7zFile.o 7zStream.o