>>> exim 4.93.0.3 Extracting
xzcat /home/buildroot/autobuild/run/instance-1/dl/exim/exim-4.93.0.3.tar.xz | tar --strip-components=1 -C /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3   -xf -
>>> exim 4.93.0.3 Patching

Applying 0001-Build-buildconfig-for-the-host.patch using patch: 
patching file OS/Makefile-Base
Hunk #1 succeeded at 246 (offset 132 lines).

Applying 0002-Don-t-make-backup-copies-of-installed-files.patch using patch: 
patching file scripts/exim_install
Hunk #1 succeeded at 345 (offset 1 line).

Applying 0003-Skip-version-check-and-symlink-installation.patch using patch: 
patching file scripts/exim_install

Applying 0004-Fix-uClibc-build.patch using patch: 
patching file OS/os.h-Linux
>>> exim 4.93.0.3 Configuring
/usr/bin/install -m 0644 /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/src/EDITME /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*BIN_DIRECTORY[[:space:]]*=.*$,BIN_DIRECTORY=/usr/sbin,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*CONFIGURE_FILE[[:space:]]*=.*$,CONFIGURE_FILE=/etc/exim/configure,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*EXIM_USER[[:space:]]*=.*$,EXIM_USER=ref:exim,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*EXIM_GROUP[[:space:]]*=.*$,EXIM_GROUP=mail,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*TRANSPORT_LMTP[[:space:]]*=.*$,TRANSPORT_LMTP=yes,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*PCRE_LIBS[[:space:]]*=.*$,PCRE_LIBS=-lpcre,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*PCRE_CONFIG[[:space:]]*=.*$,PCRE_CONFIG=no,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*HAVE_ICONV[[:space:]]*=.*$,HAVE_ICONV=no,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^\([[:space:]]*EXIM_MONITOR[[:space:]]*=.*$\),# \1,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*AUTH_PLAINTEXT[[:space:]]*=.*$,AUTH_PLAINTEXT=yes,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*AUTH_CRAM_MD5[[:space:]]*=.*$,AUTH_CRAM_MD5=yes,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^\([[:space:]]*SUPPORT_DANE[[:space:]]*=.*$\),# \1,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*USE_OPENSSL[[:space:]]*=.*$,USE_OPENSSL=yes,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
/bin/sed -i -e 's,^[#[:space:]]*USE_OPENSSL_PC[[:space:]]*=.*$,USE_OPENSSL_PC=openssl,' /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
echo "CC=/home/buildroot/autobuild/run/instance-1/output-1/host/bin/xtensa-linux-gcc" >>/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
echo "CFLAGS=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -mlongcalls -mauto-litpools -Os  " >>/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
echo "AR=/home/buildroot/autobuild/run/instance-1/output-1/host/bin/xtensa-linux-ar cq" >>/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
echo "RANLIB=/home/buildroot/autobuild/run/instance-1/output-1/host/bin/xtensa-linux-ranlib" >>/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
echo "HOSTCC=/usr/bin/gcc" >>/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
echo "HOSTCFLAGS=" >>/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/Local/Makefile
>>> exim 4.93.0.3 Building
PATH="/home/buildroot/autobuild/run/instance-1/output-1/host/bin:/home/buildroot/autobuild/run/instance-1/output-1/host/sbin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games" build=br /usr/bin/make -j1 -C /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3 makefile
make[1]: Entering directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3'

>>> Creating links to source files...
>>> Creating lookups/Makefile for building dynamic modules
>>> New Makefile & lookups/Makefile installed
>>> Use "make makefile" if you need to force rebuilding of the makefile
 
make[1]: Leaving directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3'
PATH="/home/buildroot/autobuild/run/instance-1/output-1/host/bin:/home/buildroot/autobuild/run/instance-1/output-1/host/sbin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games" PKG_CONFIG="/home/buildroot/autobuild/run/instance-1/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/run/instance-1/output-1/host/lib/pkgconfig:/home/buildroot/autobuild/run/instance-1/output-1/host/share/pkgconfig" /usr/bin/make -j1 -C /home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/build-br macro_predef CC=/usr/bin/gcc LNCC=/usr/bin/gcc CFLAGS="-O2 -I/home/buildroot/autobuild/run/instance-1/output-1/host/include" LFLAGS="-fPIC -L/home/buildroot/autobuild/run/instance-1/output-1/host/lib -Wl,-rpath,/home/buildroot/autobuild/run/instance-1/output-1/host/lib"
make[1]: Entering directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/build-br'
/bin/sh ../scripts/Configure-os.h
/usr/bin/gcc buildconfig.c
/bin/sh ../scripts/Configure-config.h "/usr/bin/make"
make[2]: Entering directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/build-br'
make[2]: `buildconfig' is up to date.
make[2]: Leaving directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/build-br'
Building configuration file config.h
>>> config.h built

/usr/bin/gcc -DMACRO_PREDEF macro_predef.c
macro_predef.c: In function 'options_from_list':
macro_predef.c:83:1: error: 'for' loop initial declarations are only allowed in C99 mode
 for (int i = 0; i < nopt; i++)  if (*(s = US opts[i].name) && *s != '*')
 ^
macro_predef.c:83:1: note: use option -std=c99 or -std=gnu99 to compile your code
make[1]: *** [macro_predef.o] Error 1
make[1]: Leaving directory `/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/build-br'
make: *** [/home/buildroot/autobuild/run/instance-1/output-1/build/exim-4.93.0.3/.stamp_built] Error 2
make: Leaving directory `/home/buildroot/autobuild/run/instance-1/buildroot'