Fix linking on solaris.

libresolv and librt are required.

ConfigureChecks.cmake

@@ -57,6 +57,16 @@ if (UNIX)
   if (HAVE_LIBNSL)
     set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} nsl)
   endif (HAVE_LIBNSL)
+  # libresolv
+  check_library_exists(resolve hstrerror "" HAVE_LIBRESOLV)
+  if (HAVE_LIBRESOLV)
+    set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} resolv)
+  endif (HAVE_LIBRESOLV)
+  check_library_exists(rt nanosleep "" HAVE_LIBRT)
+  # librt
+  if (HAVE_LIBRT)
+    set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} rt)
+  endif (HAVE_LIBRT)
 
   check_function_exists(getaddrinfo HAVE_GETADDRINFO)
   check_function_exists(gethostbyname HAVE_GETHOSTBYNAME)
@@ -65,6 +75,7 @@ if (UNIX)
   check_function_exists(cfmakeraw HAVE_CFMAKERAW)
   check_function_exists(regcomp HAVE_REGCOMP)
 endif (UNIX)
+set(LIBSSH_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} CACHE INTERNAL "libssh required system libraries")
 
 # LIBRARIES
 if (CRYPTO_FOUND)

libssh/CMakeLists.txt

@@ -25,6 +25,7 @@ if (WITH_STATIC_LIB)
 endif (WITH_STATIC_LIB)
 
 set(LIBSSH_LINK_LIBRARIES
+  ${LIBSSH_REQUIRED_LIBRARIES}
   ${ZLIB_LIBRARIES}
 )
 
@@ -35,13 +36,6 @@ if (WIN32)
   )
 endif (WIN32)
 
-if (HAVE_LIBNSL)
-  set(LIBSSH_LINK_LIBRARIES
-    ${LIBSSH_LINK_LIBRARIES}
-    nsl
-  )
-endif (HAVE_LIBNSL)
-
 if (HAVE_LIBSOCKET)
   set(LIBSSH_LINK_LIBRARIES
     ${LIBSSH_LINK_LIBRARIES}