>>> host-flex 2.6.4 Extracting
gzip -d -c /home/buildroot/autobuild/instance-0/dl/flex/flex-2.6.4.tar.gz | tar --strip-components=1 -C /home/buildroot/autobuild/instance-0/output-1/build/host-flex-2.6.4   -xf -
>>> host-flex 2.6.4 Patching

Applying 0001-build-AC_USE_SYSTEM_EXTENSIONS-in-configure.ac.patch using patch: 
patching file configure.ac

Applying 0002-build-make-it-possible-to-disable-the-build-of-the-f.patch using patch: 
patching file Makefile.am
Hunk #1 succeeded at 59 (offset -3 lines).
patching file configure.ac
Hunk #1 succeeded at 74 (offset -1 lines).
patching file src/Makefile.am

Applying 0003-build-make-it-possible-to-disable-the-build-of-the-d.patch using patch: 
patching file Makefile.am
patching file configure.ac
>>> host-flex 2.6.4 Updating config.sub and config.guess
for file in config.guess config.sub; do for i in $(find /home/buildroot/autobuild/instance-0/output-1/build/host-flex-2.6.4 -name $file); do cp support/gnuconfig/$file $i; done; done
>>> host-flex 2.6.4 Configuring
>>> host-flex 2.6.4 Gettextizing
Copying file ABOUT-NLS
Copying file build-aux/config.rpath
Copying file po/Makefile.in.in
Copying file po/Makevars.template
Copying file po/Rules-quot
Copying file po/boldquot.sed
Copying file po/en@boldquot.header
Copying file po/en@quot.header
Copying file po/insert-header.sin
Copying file po/quot.sed
Copying file po/remove-potcdate.sin
Creating po/ChangeLog
Copying file m4/gettext.m4
Copying file m4/host-cpu-c-abi.m4
cp: cannot stat '/home/buildroot/autobuild/instance-0/output-1/host/share/aclocal/host-cpu-c-abi.m4': No such file or directory
Copying file m4/iconv.m4
Copying file m4/intlmacosx.m4
Copying file m4/lib-ld.m4
Copying file m4/lib-link.m4
Copying file m4/lib-prefix.m4
Copying file m4/nls.m4
Copying file m4/po.m4
Copying file m4/progtest.m4
Updating configure.ac (backup is in configure.ac~)
Adding an entry to ChangeLog (backup is in ChangeLog~)

Please run 'aclocal -I m4' to regenerate the aclocal.m4 file.
You need aclocal from GNU automake 1.9 (or newer) to do this.
Then run 'autoconf' to regenerate the configure file.

You might also want to copy the convenience header file gettext.h
from the /home/buildroot/autobuild/instance-0/output-1/host/share/gettext directory into your package.
It is a wrapper around <libintl.h> that implements the configure --disable-nls
option.

Press Return to acknowledge the previous two paragraphs.
>>> host-flex 2.6.4 Autoreconfiguring
libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, 'build-aux'.
libtoolize: copying file 'build-aux/ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'm4'.
libtoolize: copying file 'm4/libtool.m4'
libtoolize: copying file 'm4/ltoptions.m4'
libtoolize: copying file 'm4/ltsugar.m4'
libtoolize: copying file 'm4/ltversion.m4'
libtoolize: copying file 'm4/lt~obsolete.m4'
configure.ac:34: warning: The macro `AC_CONFIG_HEADER' is obsolete.
configure.ac:34: You should run autoupdate.
./lib/autoconf/status.m4:719: AC_CONFIG_HEADER is expanded from...
configure.ac:34: the top level
configure.ac:50: warning: AC_PROG_LEX without either yywrap or noyywrap is obsolete
./lib/autoconf/programs.m4:716: _AC_PROG_LEX is expanded from...
./lib/autoconf/programs.m4:709: AC_PROG_LEX is expanded from...
aclocal.m4:668: AM_PROG_LEX is expanded from...
configure.ac:50: the top level
configure.ac:170: warning: whitespace-separated list contains macros;
configure.ac:170: in a future version of Autoconf they will not be expanded
configure.ac:170: note: `dnl' is a macro
./lib/autoconf/functions.m4:117: AC_CHECK_FUNCS is expanded from...
configure.ac:170: the top level
configure.ac:180: warning: whitespace-separated list contains macros;
configure.ac:180: in a future version of Autoconf they will not be expanded
configure.ac:180: note: `dnl' is a macro
./lib/autoconf/functions.m4:117: AC_CHECK_FUNCS is expanded from...
configure.ac:180: the top level
configure.ac:31: installing 'build-aux/compile'
configure.ac:33: installing 'build-aux/missing'
src/Makefile.am: installing 'build-aux/depcomp'
>>> host-flex 2.6.4 Patching libtool
patching file /home/buildroot/autobuild/instance-0/output-1/build/host-flex-2.6.4/build-aux/ltmain.sh
Hunk #1 succeeded at 2694 (offset 7 lines).
Hunk #2 succeeded at 4284 (offset 7 lines).
Hunk #3 succeeded at 6579 (offset 25 lines).
Hunk #4 succeeded at 6589 (offset 25 lines).
Hunk #5 succeeded at 6882 (offset 25 lines).
Hunk #6 succeeded at 7174 (offset 25 lines).
Hunk #7 succeeded at 8140 (offset 28 lines).
Hunk #8 succeeded at 10769 (offset 59 lines).
(cd /home/buildroot/autobuild/instance-0/output-1/build/host-flex-2.6.4/ && rm -rf config.cache; PATH="/home/buildroot/autobuild/instance-0/output-1/host/bin:/home/buildroot/autobuild/instance-0/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" PKG_CONFIG="/home/buildroot/autobuild/instance-0/output-1/host/bin/pkg-config" PKG_CONFIG_SYSROOT_DIR="/" PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 PKG_CONFIG_LIBDIR="/home/buildroot/autobuild/instance-0/output-1/host/lib/pkgconfig:/home/buildroot/autobuild/instance-0/output-1/host/share/pkgconfig" AR="/usr/bin/ar" AS="/usr/bin/as" LD="/usr/bin/ld" NM="/usr/bin/nm" CC="/usr/bin/gcc" GCC="/usr/bin/gcc" CXX="/usr/bin/g++" CPP="/usr/bin/cpp" OBJCOPY="/usr/bin/objcopy" RANLIB="/usr/bin/ranlib" CPPFLAGS="-I/home/buildroot/autobuild/instance-0/output-1/host/include" CFLAGS="-O2 -I/home/buildroot/autobuild/instance-0/output-1/host/include" CXXFLAGS="-O2 -I/home/buildroot/autobuild/instance-0/output-1/host/include" LDFLAGS="-L/home/buildroot/autobuild/instance-0/output-1/host/lib -Wl,-rpath,/home/buildroot/autobuild/instance-0/output-1/host/lib" INTLTOOL_PERL=/usr/bin/perl CFLAGS="-O2 -I/home/buildroot/autobuild/instance-0/output-1/host/include" LDFLAGS="-L/home/buildroot/autobuild/instance-0/output-1/host/lib -Wl,-rpath,/home/buildroot/autobuild/instance-0/output-1/host/lib"  CONFIG_SITE=/dev/null ./configure --prefix="/home/buildroot/autobuild/instance-0/output-1/host" --sysconfdir="/home/buildroot/autobuild/instance-0/output-1/host/etc" --localstatedir="/home/buildroot/autobuild/instance-0/output-1/host/var" --enable-shared --disable-static --disable-gtk-doc --disable-gtk-doc-html --disable-doc --disable-docs --disable-documentation --disable-debug --with-xmlto=no --with-fop=no --disable-nls --disable-dependency-tracking  --disable-doc )
configure: WARNING: unrecognized options: --disable-gtk-doc, --disable-gtk-doc-html, --disable-docs, --disable-documentation, --disable-debug, --with-xmlto, --with-fop
checking for gcc... /usr/bin/gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether the compiler supports GNU C... yes
checking whether /usr/bin/gcc accepts -g... yes
checking for /usr/bin/gcc option to enable C11 features... none needed
checking whether /usr/bin/gcc understands -c and -o together... yes
checking for stdio.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for strings.h... yes
checking for sys/stat.h... yes
checking for sys/types.h... yes
checking for unistd.h... yes
checking for wchar.h... yes
checking for minix/config.h... no
checking for vfork.h... no
checking whether it is safe to define __EXTENSIONS__... yes
checking whether _XOPEN_SOURCE should be defined... no
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking how to print strings... printf
checking for a sed that does not truncate output... /bin/sed
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for fgrep... /bin/grep -F
checking for ld used by /usr/bin/gcc... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm
checking the name lister (/usr/bin/nm) interface... BSD nm
checking whether ln -s works... yes
checking the maximum length of command line arguments... 1572864
checking how to convert x86_64-pc-linux-gnu file names to x86_64-pc-linux-gnu format... func_convert_file_noop
checking how to convert x86_64-pc-linux-gnu file names to toolchain format... func_convert_file_noop
checking for /usr/bin/ld option to reload object files... -r
checking for objdump... objdump
checking how to recognize dependent libraries... pass_all
checking for dlltool... no
checking how to associate runtime and link libraries... printf %s\n
checking for archiver @FILE support... @
checking for strip... strip
checking for ranlib... /usr/bin/ranlib
checking for gawk... gawk
checking command to parse /usr/bin/nm output from /usr/bin/gcc object... ok
checking for sysroot... no
checking for a working dd... /bin/dd
checking how to truncate binary pipes... /bin/dd bs=4096 count=1
checking for mt... mt
checking if mt is a manifest tool... no
checking for dlfcn.h... yes
checking for objdir... .libs
checking if /usr/bin/gcc supports -fno-rtti -fno-exceptions... no
checking for /usr/bin/gcc option to produce PIC... -fPIC -DPIC
checking if /usr/bin/gcc PIC flag -fPIC -DPIC works... yes
checking if /usr/bin/gcc static flag -static works... yes
checking if /usr/bin/gcc supports -c -o file.o... yes
checking if /usr/bin/gcc supports -c -o file.o... (cached) yes
checking whether the /usr/bin/gcc linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a race-free mkdir -p... /bin/mkdir -p
checking whether make sets $(MAKE)... yes
checking whether make supports the include directive... yes (GNU style)
checking whether make supports nested variables... yes
checking dependency style of /usr/bin/gcc... none
checking whether NLS is requested... no
checking for msgfmt... /home/buildroot/autobuild/instance-0/output-1/host/bin/msgfmt
checking for gmsgfmt... /home/buildroot/autobuild/instance-0/output-1/host/bin/msgfmt
checking for xgettext... /home/buildroot/autobuild/instance-0/output-1/host/bin/xgettext
checking for msgmerge... /home/buildroot/autobuild/instance-0/output-1/host/bin/msgmerge
checking for ld used by /usr/bin/gcc... /usr/bin/ld -m elf_x86_64
checking if the linker (/usr/bin/ld -m elf_x86_64) is GNU ld... yes
checking for shared library run path origin... done
checking how to run the C preprocessor... /usr/bin/cpp
checking for the common suffixes of directories in the library search path... lib,lib
checking for CFPreferencesCopyAppValue... no
checking for CFLocaleCopyCurrent... no
checking whether to use NLS... no
checking for bison... bison -y
checking for flex... no
checking for lex... no
checking for gcc... (cached) /usr/bin/gcc
checking whether the compiler supports GNU C... (cached) yes
checking whether /usr/bin/gcc accepts -g... (cached) yes
checking for /usr/bin/gcc option to enable C11 features... (cached) none needed
checking whether /usr/bin/gcc understands -c and -o together... (cached) yes
checking for gcc... gcc
checking whether the compiler supports GNU C... (cached) yes
checking whether gcc accepts -g... yes
checking for gcc option to enable C11 features... (cached) none needed
checking whether gcc understands -c and -o together... (cached) yes
checking how to run the C preprocessor... gcc -E
checking whether the compiler supports GNU C++... yes
checking whether /usr/bin/g++ accepts -g... yes
checking for /usr/bin/g++ option to enable C++11 features... none needed
checking how to run the C++ preprocessor... /usr/bin/g++ -E
checking for ld used by /usr/bin/g++... /usr/bin/ld -m elf_x86_64
checking if the linker (/usr/bin/ld -m elf_x86_64) is GNU ld... yes
checking whether the /usr/bin/g++ linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes
checking for /usr/bin/g++ option to produce PIC... -fPIC -DPIC
checking if /usr/bin/g++ PIC flag -fPIC -DPIC works... yes
checking if /usr/bin/g++ static flag -static works... yes
checking if /usr/bin/g++ supports -c -o file.o... yes
checking if /usr/bin/g++ supports -c -o file.o... (cached) yes
checking whether the /usr/bin/g++ linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes
checking dynamic linker characteristics... (cached) GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking dependency style of /usr/bin/g++... none
checking whether ln -s works... yes
checking for gawk... (cached) gawk
checking for help2man... ${top_srcdir}/build-aux/missing help2man
configure: WARNING: help2man: program not found: building man page will not work
checking for gtexi2dvi... no
checking for texi2dvi... no
configure: WARNING: texi2dvi: program not found: building pdf version of manual will not work
checking for m4 that supports -P... /home/buildroot/autobuild/instance-0/output-1/host/bin/m4
checking for indent... ${top_srcdir}/build-aux/missing indent
checking if ${top_srcdir}/build-aux/missing indent is GNU indent... no
configure: WARNING: ${top_srcdir}/build-aux/missing indent does not appear to be GNU indent; 'make indent' may not function properly
checking for regex.h... yes
checking for strings.h... (cached) yes
checking for sys/stat.h... (cached) yes
checking for sys/wait.h... yes
checking for unistd.h... (cached) yes
checking for inttypes.h... (cached) yes
checking for libintl.h... yes
checking for limits.h... yes
checking for locale.h... yes
checking for malloc.h... yes
checking for netinet/in.h... yes
checking for pthread_mutex_lock in -lpthread... yes
checking for pthread.h... yes
checking for log10 in -lm... yes
checking for _Bool... yes
checking for stdbool.h that conforms to C99... yes
checking for an ANSI C-conforming const... yes
checking for size_t... yes
checking for working alloca.h... yes
checking for alloca... yes
checking for pid_t... yes
checking for fork... yes
checking for vfork... yes
checking for working fork... yes
checking for working vfork... (cached) yes
checking for GNU libc compatible malloc... yes
checking for GNU libc compatible realloc... yes
checking for dup2... yes
checking for memset... yes
checking for regcomp... no
configure: error: required library function not found on your system
package/pkg-generic.mk:272: recipe for target '/home/buildroot/autobuild/instance-0/output-1/build/host-flex-2.6.4/.stamp_configured' failed
make: *** [/home/buildroot/autobuild/instance-0/output-1/build/host-flex-2.6.4/.stamp_configured] Error 1
make: Leaving directory '/home/buildroot/autobuild/instance-0/buildroot'