source % ./runConfigureICU --help
Usage: runConfigureICU [ -h, --help ]  [ --enable-debug | --disable-release ] platform [ configurearg ... ]

Options: -h, --help         Print this message and exit
         --enable-debug     Enable support for debugging
         --disable-release  Disable presetting optimization flags

If you want to add custom CFLAGS or CXXFLAGS or similar, provide them _before_
the runConfigureICU command:

    CXXFLAGS=xyz path/to/runConfigureICU --enable-debug ...

The following names can be supplied as the argument for platform:

    AIX                 Use the IBM Visual Age xlc_r/xlC_r compilers on AIX
    AIX/GCC             Use the GNU gcc/g++ compilers on AIX
    Cygwin              Use the GNU gcc/g++ compilers on Cygwin
    Cygwin/MSVC         Use the Microsoft Visual C++ compiler on Cygwin
    Cygwin/MSVC2005     Use the Microsoft Visual C++ 2005 compiler on Cygwin
    Cygwin/ICL          Use the Intel C++ compiler on Cygwin
    FreeBSD             Use the clang/clang++ or GNU gcc/g++ compilers on FreeBSD
    HP-UX/ACC           Use the HP ANSI C/Advanced C++ compilers on HP-UX 11
    IBMi                Use the iCC compilers on IBM i, i5/OS, OS/400
    Linux               Use the clang/clang++ or GNU gcc/g++ compilers on Linux
    Linux/gcc           Use the GNU gcc/g++ compilers on Linux
    Linux/ECC           Use the Intel ECC compiler on Linux
    Linux/ICC           Use the Intel ICC compiler on Linux
    Linux/VA            Use the IBM Visual Age compiler on Power PC Linux
    MacOSX              Use the default compilers on MacOS X (Darwin)
    MacOSX/GCC          Use the GNU gcc/g++ compilers on MacOSX (Darwin)
    MinGW               Use the GNU gcc/g++ compilers on MinGW
    MSYS/MSVC           Use the Microsoft Visual C++ computer on MSYS
    QNX                 Use the QNX QCC compiler on QNX/Neutrino
    Solaris             Use the Sun cc/CC compilers on Solaris
    Solaris/GCC         Use the GNU gcc/g++ compilers on Solaris
    SolarisX86          Use the Sun cc/CC compilers on Solaris x86
    TRU64V5.1/CXX       Use the Compaq cxx compiler on Tru64 (OSF)
    zOS                 Use the IBM cxx compiler on z/OS (os/390)
    zOSV1R2             Use the IBM cxx compiler for z/OS 1.2