>>> stunnel 5.36 Building PATH="/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/bin:/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/sbin:/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/bin:/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/sbin:/root/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.9.4" /usr/bin/make -j21 -C /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36/ make[1]: Entering directory '/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36' Making all in src make[2]: Entering directory '/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36/src' /usr/bin/make all-am make[3]: Entering directory '/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36/src' CCLD stunnel /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/x86_64-buildroot-linux-uclibc/sysroot/usr/lib64/libcrypto.a(c_zlib.o): In function `zlib_stateful_expand_block': c_zlib.c:(.text+0x59): undefined reference to `inflate' /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/x86_64-buildroot-linux-uclibc/sysroot/usr/lib64/libcrypto.a(c_zlib.o): In function `zlib_stateful_compress_block': c_zlib.c:(.text+0xea): undefined reference to `deflate' /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/x86_64-buildroot-linux-uclibc/sysroot/usr/lib64/libcrypto.a(c_zlib.o): In function `bio_zlib_free': c_zlib.c:(.text+0x13e): undefined reference to `inflateEnd' c_zlib.c:(.text+0x15d): undefined reference to `deflateEnd' /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/x86_64-buildroot-linux-uclibc/sysroot/usr/lib64/libcrypto.a(c_zlib.o): In function `zlib_stateful_finish': c_zlib.c:(.text+0x1d0): undefined reference to `inflateEnd' c_zlib.c:(.text+0x1d9): undefined reference to `deflateEnd' /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/x86_64-buildroot-linux-uclibc/sysroot/usr/lib64/libcrypto.a(c_zlib.o): In function `zlib_stateful_init': c_zlib.c:(.text+0x268): undefined reference to `inflateInit_' c_zlib.c:(.text+0x2d9): undefined reference to `deflateInit_' /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/x86_64-buildroot-linux-uclibc/sysroot/usr/lib64/libcrypto.a(c_zlib.o): In function `bio_zlib_ctrl': c_zlib.c:(.text+0x544): undefined reference to `deflate' c_zlib.c:(.text+0x61a): undefined reference to `zError' /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/x86_64-buildroot-linux-uclibc/sysroot/usr/lib64/libcrypto.a(c_zlib.o): In function `bio_zlib_write': c_zlib.c:(.text+0x839): undefined reference to `deflate' c_zlib.c:(.text+0x8fa): undefined reference to `zError' c_zlib.c:(.text+0x95d): undefined reference to `deflateInit_' /root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/host/usr/x86_64-buildroot-linux-uclibc/sysroot/usr/lib64/libcrypto.a(c_zlib.o): In function `bio_zlib_read': c_zlib.c:(.text+0xa2f): undefined reference to `inflate' c_zlib.c:(.text+0xa9a): undefined reference to `zError' c_zlib.c:(.text+0xb0d): undefined reference to `inflateInit_' collect2: error: ld returned 1 exit status Makefile:531: recipe for target 'stunnel' failed make[3]: *** [stunnel] Error 1 make[3]: Leaving directory '/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36/src' Makefile:393: recipe for target 'all' failed make[2]: *** [all] Error 2 make[2]: Leaving directory '/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36/src' Makefile:445: recipe for target 'all-recursive' failed make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory '/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36' package/pkg-generic.mk:216: recipe for target '/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36/.stamp_built' failed make: *** [/root/Personal/Projects/minimal-linux/buildroot-2016.11.2/output/build/stunnel-5.36/.stamp_built] Error 2
Thanks for the bug report. This has already been fixed in commit https://git.buildroot.org/buildroot/commit/package/stunnel?id=b575baeb1ad787dac1ce31343adfd6ee3415ca41, which will be part of the upcoming 2017.02 release. In the mean time, you can cherry-pick this commit in your tree.
Notice: I have also added it to the 2016.11.x branch and it will be part of the upcoming 2016.11.3 release.