Here's the command:

/home/dan/buildrootstuff/buildroot/build_i386/staging_dir/usr/bin/i386-linux-uclibc-gcc -Os -pipe -Os -I/home/dan/buildrootstuff/buildroot/build_i386/staging_dir/usr/include -I/home/dan/buildrootstuff/buildroot/build_i386/staging_dir/include --sysroot=/home/dan/buildrootstuff/buildroot/build_i386/staging_dir/ -isysroot /home/dan/buildrootstuff/buildroot/build_i386/staging_dir -mtune=i386 -march=i386 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -std=gnu99 -g -O2 -o tar buffer.o compare.o create.o delete.o extract.o xheader.o incremen.o list.o misc.o names.o sparse.o system.o tar.o transform.o update.o utf8.o ../lib/libtar.a

Here's the error:

../lib/libtar.a(argp-fmtstream.o): In function `argp_fmtstream_putc':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:233: multiple definition of `argp_fmtstream_putc'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:233: first defined here
../lib/libtar.a(argp-fmtstream.o): In function `argp_fmtstream_point':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:279: multiple definition of `argp_fmtstream_point'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:279: first defined here
../lib/libtar.a(argp-fmtstream.o): In function `argp_fmtstream_set_wmargin':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:267: multiple definition of `argp_fmtstream_set_wmargin'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:267: first defined here
../lib/libtar.a(argp-fmtstream.o): In function `argp_fmtstream_set_rmargin':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:255: multiple definition of `argp_fmtstream_set_rmargin'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:255: first defined here
../lib/libtar.a(argp-fmtstream.o): In function `argp_fmtstream_set_lmargin':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:243: multiple definition of `argp_fmtstream_set_lmargin'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:243: first defined here
../lib/libtar.a(argp-fmtstream.o): In function `argp_fmtstream_write':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:207: multiple definition of `argp_fmtstream_write'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:207: first defined here
../lib/libtar.a(argp-fmtstream.o): In function `argp_fmtstream_puts':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:220: multiple definition of `argp_fmtstream_puts'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:220: first defined here
../lib/libtar.a(argp-help.o): In function `argp_fmtstream_point':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:279: multiple definition of `argp_fmtstream_point'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:279: first defined here
../lib/libtar.a(argp-help.o): In function `argp_fmtstream_set_wmargin':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:267: multiple definition of `argp_fmtstream_set_wmargin'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:267: first defined here
../lib/libtar.a(argp-help.o): In function `argp_fmtstream_set_rmargin':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:255: multiple definition of `argp_fmtstream_set_rmargin'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:255: first defined here
../lib/libtar.a(argp-help.o): In function `argp_fmtstream_set_lmargin':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:243: multiple definition of `argp_fmtstream_set_lmargin'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:243: first defined here
../lib/libtar.a(argp-help.o): In function `argp_fmtstream_putc':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:233: multiple definition of `argp_fmtstream_putc'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:233: first defined here
../lib/libtar.a(argp-help.o): In function `argp_fmtstream_write':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:207: multiple definition of `argp_fmtstream_write'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:207: first defined here
../lib/libtar.a(argp-help.o): In function `argp_fmtstream_puts':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/argp-fmtstream.h:220: multiple definition of `argp_fmtstream_puts'
tar.o:/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src/../lib/argp-fmtstream.h:220: first defined here
../lib/libtar.a(close-stream.o): In function `close_stream':
/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/lib/close-stream.c:56: warning: This version of __fpending returns bytes remaining in buffer for both narrow and wide streams. glibc's version returns wide chars in buffer for the wide stream case.
collect2: ld returned 1 exit status
make[3]: *** [tar] Error 1
make[3]: Leaving directory `/home/dan/buildrootstuff/buildroot/build_i386/tar-1.18/src'


Surely if uclibc is not supported by tar, it shouldn't try to compile it in the first place?