/bin/sh ../../libtool --tag=CC --mode=link gcc  -g -O2   -o ssh2  ssh2
+.o ../../src/libssh2.la
libtool: link: gcc -g -O2 -o .libs/ssh2 ssh2.o  ../../src/.libs/libssh
+2.so -L/usr/local/ssl/lib -lssl -lcrypto -lz -Wl,-rpath -Wl,/usr/loca
+l/lib
../../src/.libs/libssh2.so: undefined reference to `dlerror'
../../src/.libs/libssh2.so: undefined reference to `dlclose'
../../src/.libs/libssh2.so: undefined reference to `dlopen'
../../src/.libs/libssh2.so: undefined reference to `dlsym'
[download]

Looks like a problem with libdl not having been found during ./configure, so that the required -ldl is missing from the link command  (the dl library implements dlopen etc. which are used for run-time dynamic linking of shared libs).

Maybe check

• if you actually have the lib (would typically be in /lib or /lib64 or /usr/lib or /usr/lib64, e.g. /lib/libdl.so.2)
• what the configure output has to say (--> "checking for dlopen ...", or some such)
• if the link command succeeds if you manually issue it with -ldl added (from the directory where ssh2.o is), i.e.

  $ gcc -g -O2 -o .libs/ssh2 ssh2.o  ../../src/.libs/libssh2.so -L/usr/l
  +ocal/ssl/lib -ldl -lssl -lcrypto -lz -Wl,-rpath -Wl,/usr/local/lib
  [download]