>>> libcurl 7.71.1 Extracting
xzcat /tmp/instance-1/dl/libcurl/curl-7.71.1.tar.xz | /tmp/instance-1/output-1/host/bin/tar --strip-components=1 -C /tmp/instance-1/output-1/build/libcurl-7.71.1   -xf -
>>> libcurl 7.71.1 Patching

Applying 0001-bearssl-fix-build-with-disabled-proxy-support.patch using patch: 
patching file lib/vtls/bearssl.c

Applying 0002-nss-fix-build-with-disabled-proxy-support.patch using patch: 
patching file lib/vtls/nss.c
>>> libcurl 7.71.1 Updating config.sub and config.guess
for file in config.guess config.sub; do for i in $(find /tmp/instance-1/output-1/build/libcurl-7.71.1 -name $file); do cp support/gnuconfig/$file $i; done; done
>>> libcurl 7.71.1 Patching libtool
patching file /tmp/instance-1/output-1/build/libcurl-7.71.1/ltmain.sh
Hunk #1 succeeded at 2786 (offset 99 lines).
Hunk #2 succeeded at 4376 (offset 99 lines).
Hunk #3 succeeded at 6671 (offset 117 lines).
Hunk #4 succeeded at 6681 (offset 117 lines).
Hunk #5 succeeded at 6974 (offset 117 lines).
Hunk #6 succeeded at 7266 (offset 117 lines).
Hunk #7 succeeded at 8241 (offset 129 lines).
Hunk #8 succeeded at 10873 (offset 163 lines).
>>> libcurl 7.71.1 Configuring
(cd /tmp/instance-1/output-1/build/libcurl-7.71.1/ && rm -rf config.cache && PATH="/tmp/instance-1/output-1/host/bin:/tmp/instance-1/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin" AR="/tmp/instance-1/output-1/host/bin/arm-linux-ar" AS="/tmp/instance-1/output-1/host/bin/arm-linux-as" LD="/tmp/instance-1/output-1/host/bin/arm-linux-ld" NM="/tmp/instance-1/output-1/host/bin/arm-linux-nm" CC="/tmp/instance-1/output-1/host/bin/arm-linux-gcc" GCC="/tmp/instance-1/output-1/host/bin/arm-linux-gcc" CPP="/tmp/instance-1/output-1/host/bin/arm-linux-cpp" CXX="/tmp/instance-1/output-1/host/bin/arm-linux-g++" FC="/tmp/instance-1/output-1/host/bin/arm-linux-gfortran" F77="/tmp/instance-1/output-1/host/bin/arm-linux-gfortran" RANLIB="/tmp/instance-1/output-1/host/bin/arm-linux-ranlib" READELF="/tmp/instance-1/output-1/host/bin/arm-linux-readelf" STRIP="/tmp/instance-1/output-1/host/bin/arm-linux-strip" OBJCOPY="/tmp/instance-1/output-1/host/bin/arm-linux-objcopy" OBJDUMP="/tmp/instance-1/output-1/host/bin/arm-linux-objdump" AR_FOR_BUILD="/usr/bin/ar" AS_FOR_BUILD="/usr/bin/as" CC_FOR_BUILD="/usr/bin/gcc" GCC_FOR_BUILD="/usr/bin/gcc" CXX_FOR_BUILD="/usr/bin/g++" LD_FOR_BUILD="/usr/bin/ld" CPPFLAGS_FOR_BUILD="-I/tmp/instance-1/output-1/host/include" CFLAGS_FOR_BUILD="-O2 -I/tmp/instance-1/output-1/host/include" CXXFLAGS_FOR_BUILD="-O2 -I/tmp/instance-1/output-1/host/include" LDFLAGS_FOR_BUILD="-L/tmp/instance-1/output-1/host/lib -Wl,-rpath,/tmp/instance-1/output-1/host/lib" FCFLAGS_FOR_BUILD="" DEFAULT_ASSEMBLER="/tmp/instance-1/output-1/host/bin/arm-linux-as" DEFAULT_LINKER="/tmp/instance-1/output-1/host/bin/arm-linux-ld" CPPFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64" CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O2    -Wl,-elf2flt -static" CXXFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O2    -Wl,-elf2flt -static  -Wl,-elf2flt -static" LDFLAGS=" -Wl,-elf2flt -static" FCFLAGS=" -O2   -Wl,-elf2flt -static" FFLAGS=" -O2   -Wl,-elf2flt -static" PKG_CONFIG="/tmp/instance-1/output-1/host/bin/pkg-config" STAGING_DIR="/tmp/instance-1/output-1/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot" INTLTOOL_PERL=/usr/bin/perl ac_cv_lbl_unaligned_fail=yes ac_cv_func_mmap_fixed_mapped=yes ac_cv_func_memcmp_working=yes ac_cv_have_decl_malloc=yes gl_cv_func_malloc_0_nonnull=yes ac_cv_func_malloc_0_nonnull=yes ac_cv_func_calloc_0_nonnull=yes ac_cv_func_realloc_0_nonnull=yes lt_cv_sys_lib_search_path_spec="" ac_cv_c_bigendian=no   CONFIG_SITE=/dev/null ./configure --target=arm-buildroot-uclinux-uclibcgnueabi --host=arm-buildroot-uclinux-uclibcgnueabi --build=x86_64-pc-linux-gnu --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --localstatedir=/var --program-prefix="" --disable-gtk-doc --disable-gtk-doc-html --disable-doc --disable-docs --disable-documentation --with-xmlto=no --with-fop=no --disable-dependency-tracking --enable-ipv6 --disable-nls --enable-static --disable-shared  --disable-manual --disable-ntlm-wb --enable-hidden-symbols --with-random=/dev/urandom --disable-curldebug --disable-libcurl-option --enable-threaded-resolver --disable-verbose --without-ssl --without-bearssl --without-gnutls --without-nss --without-mbedtls --with-wolfssl=/tmp/instance-1/output-1/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot/usr --disable-ares --without-libidn2 --without-libssh2 --without-brotli --with-nghttp2 --disable-cookies --enable-proxy --enable-dict --enable-gopher --enable-imap --enable-ldap --enable-ldaps --enable-pop3 --enable-rtsp --enable-smb --enable-smtp --enable-telnet --enable-tftp )
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configure: CFLAGS note: CFLAGS should only be used to specify C compiler flags, not macro definitions. Use CPPFLAGS for: -D_LARGEFILE_SOURCE
configure: CFLAGS note: CFLAGS should only be used to specify C compiler flags, not macro definitions. Use CPPFLAGS for: -D_LARGEFILE64_SOURCE
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checking size of size_t... configure: error: cannot determine a size for size_t
make: *** [package/pkg-generic.mk:240: /tmp/instance-1/output-1/build/libcurl-7.71.1/.stamp_configured] Error 1
make: Leaving directory '/tmp/instance-1/buildroot'