How to Resolve undefined reference to 'RAND_egd'

**Debian 8 Jessie, OpenSSL version 1.1.0, cURL version: 7.50.2** I am trying to build curl on a Linux Debian system. All stages go well up until trying to build with make command. The linking stage fails with the following error below: CC ../lib/curl-nonblock.o CC ../lib/curl-warnless.o CCLD curl ../lib/.libs/libcurl.so: undefined reference to 'RAND_egd' collect2: error: ld returned 1 exit status Makefile:771: recipe for target 'curl' failed make: *** [curl] Error 1 RAND_egd function is part of the OpenSSL library so I ran ldd on the libcurl.so file to make sure the OpenSSL library is found, and it is judging by the output from ldd below. linux-vdso.so.1 (0x00007ffceb5a1000) libnghttp2.so.14 => /usr/lib/x86_64-linux-gnu/libnghttp2.so.14 (0x00007ff9ffc05000) libidn.so.11 => /usr/lib/x86_64-linux-gnu/libidn.so.11 (0x00007ff9ff9d1000) libssh2.so.1 => /usr/lib/x86_64-linux-gnu/libssh2.so.1 (0x00007ff9ff7a8000) libssl.so.1.1 => /usr/local/lib/libssl.so.1.1 (0x00007ff9ff53a000) libcrypto.so.1.1 => /usr/local/lib/libcrypto.so.1.1 (0x00007ff9ff0af000) liblber-2.4.so.2 => /usr/lib/x86_64-linux-gnu/liblber-2.4.so.2 (0x00007ff9feea0000) libldap_r-2.4.so.2 => /usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2 (0x00007ff9fec4e000) libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ff9fea33000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff9fe688000) libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007ff9fe3a6000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ff9fe1a2000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff9fdf85000) libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007ff9fdd6e000) libsasl2.so.2 => /usr/lib/x86_64-linux-gnu/libsasl2.so.2 (0x00007ff9fdb52000) libgnutls-deb0.so.28 => /usr/lib/x86_64-linux-gnu/libgnutls-deb0.so.28 (0x00007ff9fd833000) /lib64/ld-linux-x86-64.so.2 (0x00007ffa0009e000) libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007ff9fd621000) libp11-kit.so.0 => /usr/lib/x86_64-linux-gnu/libp11-kit.so.0 (0x00007ff9fd3db000) libtasn1.so.6 => /usr/lib/x86_64-linux-gnu/libtasn1.so.6 (0x00007ff9fd1c7000) libnettle.so.4 => /usr/lib/x86_64-linux-gnu/libnettle.so.4 (0x00007ff9fcf95000) libhogweed.so.2 => /usr/lib/x86_64-linux-gnu/libhogweed.so.2 (0x00007ff9fcd66000) libgmp.so.10 => /usr/lib/x86_64-linux-gnu/libgmp.so.10 (0x00007ff9fcae3000) libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007ff9fc8db000) So the library is there. I also checked the rand.h file in the include directory of OpenSSL and of course the function declaration is there, so it should be defined in the library. How can I find the cause of and resolve this error?