diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index 6b9fbfe77c4..7e0c2b67ea3 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -469,14 +469,6 @@ qt_internal_extend_target(Core CONDITION MSVC AND (TEST_architecture_arch STREQU
         "/BASE:0x67000000"
 )
 
-# QtCore can't be compiled with -Wl,-no-undefined because it uses the
-# "environ" variable and FreeBSD does not include a weak symbol for it
-# in libc.
-qt_internal_extend_target(Core CONDITION FREEBSD
-    LINK_OPTIONS
-      "LINKER:--warn-unresolved-symbols"
-)
-
 qt_internal_extend_target(Core CONDITION QT_FEATURE_xmlstream
     SOURCES
         serialization/qxmlstream.cpp serialization/qxmlstream.h serialization/qxmlstream_p.h
diff --git a/src/corelib/io/qprocess_unix.cpp b/src/corelib/io/qprocess_unix.cpp
index 7cd379f9fd2..5ada8b520a0 100644
--- a/src/corelib/io/qprocess_unix.cpp
+++ b/src/corelib/io/qprocess_unix.cpp
@@ -52,6 +52,11 @@
 #  define O_PATH        0
 #endif
 
+#ifdef Q_OS_FREEBSD
+__attribute__((weak))
+#endif
+extern char **environ;
+
 QT_BEGIN_NAMESPACE
 
 using namespace Qt::StringLiterals;
@@ -80,10 +85,6 @@ struct PThreadCancelGuard
 
 #if !defined(Q_OS_DARWIN)
 
-QT_BEGIN_INCLUDE_NAMESPACE
-extern char **environ;
-QT_END_INCLUDE_NAMESPACE
-
 QProcessEnvironment QProcessEnvironment::systemEnvironment()
 {
     QProcessEnvironment env;