1 files changed, 4 insertions, 1 deletions

diff --git a/Depends.cmake b/Depends.cmake
index c92c9ef7..7507ebc6 100644
--- a/Depends.cmake
+++ b/Depends.cmake
@@ -30,7 +30,10 @@ else ()
     add_subdirectory (lib/the_Foundation)
     add_library (the_Foundation::the_Foundation ALIAS the_Foundation)
     if (NOT OPENSSL_FOUND)
-        message (FATAL_ERROR "OpenSSL is required for TLS. Please check if pkg-config can find openssl.")
+        message (FATAL_ERROR "Lagrange requires OpenSSL for TLS. Please check if pkg-config can find 'openssl'.")
+    endif ()
+    if (NOT ZLIB_FOUND)
+        message (FATAL_ERROR "Lagrange requires zlib for reading compressed archives. Please check if pkg-config can find 'zlib'.")
     endif ()
 endif ()
 find_package (PkgConfig REQUIRED)