cmake: Fail if can't find OpenSSL aes and des headers

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

ConfigureChecks.cmake

@@ -65,23 +65,31 @@ if (WIN32)
   check_include_files("winsock2.h;ws2tcpip.h" HAVE_WS2TCPIP_H)
 endif (WIN32)
 
-set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
-check_include_file(openssl/aes.h HAVE_OPENSSL_AES_H)
+if (OPENSSL_FOUND)
+    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
+    check_include_file(openssl/des.h HAVE_OPENSSL_DES_H)
+    if (NOT HAVE_OPENSSL_DES_H)
+        message(FATAL_ERROR "Could not detect openssl/des.h")
+    endif()
 
-set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
-check_include_file(openssl/blowfish.h HAVE_OPENSSL_BLOWFISH_H)
+    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
+    check_include_file(openssl/aes.h HAVE_OPENSSL_AES_H)
+    if (NOT HAVE_OPENSSL_AES_H)
+        message(FATAL_ERROR "Could not detect openssl/aes.h")
+    endif()
 
-set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
-check_include_file(openssl/des.h HAVE_OPENSSL_DES_H)
+    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
+    check_include_file(openssl/blowfish.h HAVE_OPENSSL_BLOWFISH_H)
 
-set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
-check_include_file(openssl/ecdh.h HAVE_OPENSSL_ECDH_H)
+    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
+    check_include_file(openssl/ecdh.h HAVE_OPENSSL_ECDH_H)
 
-set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
-check_include_file(openssl/ec.h HAVE_OPENSSL_EC_H)
+    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
+    check_include_file(openssl/ec.h HAVE_OPENSSL_EC_H)
 
-set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
-check_include_file(openssl/ecdsa.h HAVE_OPENSSL_ECDSA_H)
+    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIRS})
+    check_include_file(openssl/ecdsa.h HAVE_OPENSSL_ECDSA_H)
+endif()
 
 if (CMAKE_HAVE_PTHREAD_H)
   set(HAVE_PTHREAD_H 1)