/usr/bin/faust2w32vst is in faust 0.9.95~repack1-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#####################################################################
#                                                                   #
#               Cross-compiles Faust programs to VST plugins        #
#					form 	: Linux									#
#					to		: Windows 32							#
#               (c) Grame, 2014                                     #
#                                                                   #
#####################################################################
#------------------------------------------------------------------------------
# 1/ VST SDK Should be installed somewhere
VST=/usr/local/include/vstsdk2.4
# these cpp files have to be compiled too
VSTSRC="$VST/public.sdk/source/vst2.x/audioeffect.cpp $VST/public.sdk/source/vst2.x/audioeffectx.cpp $VST/public.sdk/source/vst2.x/vstplugmain.cpp "
#------------------------------------------------------------------------------
# mingw crosscompiler should be installed ('mingw32' package on Ubuntu)
# It must be in the PATH and the exact prefix should be specified in
# the environment variable MINGWPREFIX
: ${MINGWPREFIX="i686-w64-mingw32-"}
CXX="${MINGWPREFIX}g++"
(which "$CXX" >/dev/null) || (echo "MingW compiler $CXX not found"; exit 1)
DLLWRAP="${MINGWPREFIX}dllwrap --target=i686-w64-mingw32"
STRIP="${MINGWPREFIX}strip"
#-----------------------------------------------------------------------------
# Compilation flags
CXXFLAGS="-O3 -mfpmath=sse -msse -ffast-math -DBUILDING_DLL -Wno-multichar -Wno-write-strings"
CXXINCS=" -I$VST -I$VST/public.sdk/source/vst2.x"
EXT=".dll"
#-------------------------------------------------------------------
# Analyze command arguments :
# faust options                 -> OPTIONS
# if -omp : -openmp or -fopenmp -> OPENMP
# existing *.dsp files          -> FILES
#
#PHASE 2 : dispatch command arguments
for p in $@; do
    if [ "$p" = -omp ]; then
        if [[ $CXX == "icpc" ]]; then
            OMP="-openmp"
        else
            OMP="-fopenmp"
        fi
    fi
    if [ "$p" = -icc ]; then
    	ignore=" "
    elif [ ${p:0:1} = "-" ]; then
	    OPTIONS="$OPTIONS $p"
	elif [[ -e "$p" ]]; then
	    FILES="$FILES $p"
	else
	    OPTIONS="$OPTIONS $p"
	fi
done
BINARIES=""
#PHASE 3 : Compile each dsp files in $FILES
for p in $FILES; do
    CUR=$(pwd)
    f=$(basename "$p")
	SRCDIR=$(dirname "$p")
    # creates a temporary dir
    TDR=$(mktemp -d faust.XXX)
	TMP="$TDR/${f%.dsp}"
    mkdir "$TMP"
    # compile faust to c++
	faust -i -a vst.cpp $OPTIONS "$SRCDIR/$f" -o "$TMP/${f%.dsp}.cpp" || exit
    # compile c++ to binary
    (
		cd "$TMP"
		# we need to create the .def file needed to generate the .dll
		echo "LIBRARY     ${f%.dsp}" 						 > ${f%.dsp}.def
		echo "DESCRIPTION 'Faust generated VST plugin'" 	>> ${f%.dsp}.def
		echo "EXPORTS     VSTPluginMain" 					>> ${f%.dsp}.def
		$CXX $CXXINCS $CXXFLAGS -c "$VST/public.sdk/source/vst2.x/audioeffect.cpp" -o audioeffect.o
		$CXX $CXXINCS $CXXFLAGS -c "$VST/public.sdk/source/vst2.x/audioeffectx.cpp" -o audioeffectx.o
		$CXX $CXXINCS $CXXFLAGS -c "$VST/public.sdk/source/vst2.x/vstplugmain.cpp" -o vstplugmain.o
		$CXX $CXXINCS $CXXFLAGS -c "${f%.dsp}.cpp" -o "${f%.dsp}.o"
		$DLLWRAP --driver-name $CXX --def ${f%.dsp}.def *.o  $LIBS -static-libstdc++ -static-libgcc -o "${f%.dsp}$EXT"
		$STRIP "${f%.dsp}$EXT"
    ) > /dev/null || exit
	cp "$TMP/${f%.dsp}$EXT" "$SRCDIR"
    # remove temporary directory
    rm -rf "$TDR"
    # collect binary file name for FaustWorks
    BINARIES="$BINARIES$SRCDIR/${f%.dsp}$EXT;"
done
echo "$BINARIES"
 |