*intermittent* sip4-tqt build failure on first try ( /usr/bin/flex: Unrecognized option `W' )

All, GIGO right - computers, given the same input should produce the same output every time. If it's garbage in it's garbage out. The build of sip4-tqt seems to violate that adage. When attempt to build sip4-tqt (the first time/randomly), I get a failure: gcc -c -march=i686 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2 -I/usr/include/tqt -I/opt/trinity/include -I/opt/tqt3/include -O2 -w -DNDEBUG -I. -o parser.o parser.c lex -Wl,-O1,--sort-common,--as-needed,-z,relro,--hash-style=gnu -t lexer.l > lexer.c /usr/bin/flex: Unrecognized option `W' Try `flex --help' for more information. make[1]: *** [lexer.c] Error 1 make[1]: Leaving directory `/build/src/sipPy3/sipgen' make: *** [all] Error 2 The only 'W' that could be causing the error is the LDFLAGS string '-Wl,-O1,--sort-common,--as-needed,-z,relro,--hash-style=gnu', but that hasn't caused a problem before so I just issue the build command again - and it builds without issue - WTF? Looking at the lex command above I see: lex -Wl,-O1,--sort-common,--as-needed,-z,relro,--hash-style=gnu -t lexer.l > lexer.c That doesn't seem right. I don't know lex from fred, passing 'lex ${LDFLAGS} -t lexer.l > lexer.c' doesn't seem right because there is no '-Wl,-O1,--sort-common,--as-needed,-z,relro,--hash-style=gnu' c syntax that I know of :) Has anyone else seen this spurious behavior? I kills rebuilds when it causes sip build failures I haven't changed a thing, and I get different results. The build is simple: <snip> cd ${srcdir} ## copy source for Python build cp -r ${pkgbase#*-} sipPy3 ## Python version msg "Running python configure.py (python3 based sip)...." cd ${srcdir}/sipPy3 python configure.py CFLAGS="${CFLAGS}" LFLAGS="${LDFLAGS}" msg "Building - tde-sip (python3 based sip)..." make ## Python2 version msg "Running python2 configure.py (sip4-tqt)...." cd ${srcdir}/${pkgbase#*-} python2 configure.py CFLAGS="${CFLAGS}" LFLAGS="${LDFLAGS}" msg "Building - ${pkgbase}..." make } Any thoughts? -- David C. Rankin, J.D.,P.E.