diff --git a/CMakeLists.txt b/CMakeLists.txt
index 27a130c151..60279e04a0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -912,7 +912,8 @@ if(USE_LIBIDN2)
   if(HAVE_LIBIDN2)
     set(LIBIDN2_LINK_LIBRARIES "idn2")
     check_include_file_concat("idn2.h" HAVE_IDN2_H)
-  else()
+  endif()
+  if(NOT HAVE_LIBIDN2 OR NOT HAVE_IDN2_H)
     find_package(PkgConfig QUIET)
     pkg_check_modules(LIBIDN2 "libidn2")
     if(LIBIDN2_FOUND)
@@ -921,7 +922,7 @@ if(USE_LIBIDN2)
       set(HAVE_IDN2_H ON)
     endif()
   endif()
-  if(HAVE_LIBIDN2)
+  if(HAVE_LIBIDN2 AND HAVE_IDN2_H)
     set(CURL_LIBS "${LIBIDN2_LINK_LIBRARIES};${CURL_LIBS}")
     set(LIBCURL_PC_REQUIRES_PRIVATE "libidn2;${LIBCURL_PC_REQUIRES_PRIVATE}")
   endif()
@@ -1727,7 +1728,9 @@ if(NOT CURL_DISABLE_INSTALL)
   _add_if("gsasl"         USE_GSASL)
   _add_if("zstd"          HAVE_ZSTD)
   _add_if("AsynchDNS"     USE_ARES OR USE_THREADS_POSIX OR USE_THREADS_WIN32)
-  _add_if("IDN"           HAVE_LIBIDN2 OR USE_WIN32_IDN OR USE_APPLE_IDN)
+  _add_if("IDN"           (HAVE_LIBIDN2 AND HAVE_IDN2_H) OR
+                          USE_WIN32_IDN OR
+                          USE_APPLE_IDN)
   _add_if("Largefile"     (SIZEOF_CURL_OFF_T GREATER 4) AND
                           ((SIZEOF_OFF_T GREATER 4) OR USE_WIN32_LARGE_FILES))
   _add_if("SSPI"          USE_WINDOWS_SSPI)