diff --git a/config.h.meson b/config.h.meson
index b917bb5320e0608e787cf871eeefa5ccf3c62153..93495755d5f027087fd7af2f149c39bd4a26c7c2 100644
--- a/config.h.meson
+++ b/config.h.meson
@@ -20,9 +20,6 @@
 /* define if we have colord */
 #mesondefine HAVE_COLORD
 
-/* Define to 1 if you have the <crt_externs.h> header file. */
-#mesondefine HAVE_CRT_EXTERNS_H
-
 /* Define if the GNU dcgettext() function is already present or preinstalled.
    */
 #mesondefine HAVE_DCGETTEXT
@@ -209,9 +206,6 @@
 /* Define if _NL_TIME_FIRST_WEEKDAY is available */
 #mesondefine HAVE__NL_TIME_FIRST_WEEKDAY
 
-/* Define to 1 if you have the `_NSGetEnviron' function. */
-#mesondefine HAVE__NSGETENVIRON
-
 /* Define to the address where bug reports for this package should be sent. */
 #mesondefine PACKAGE_BUGREPORT
 
diff --git a/config.h.win32.in b/config.h.win32.in
index b6d8062c3201013a548b2db7fe97e7be51db4bff..62fe46149ce58bffeaa2f4816814a8f526a55dc1 100644
--- a/config.h.win32.in
+++ b/config.h.win32.in
@@ -26,9 +26,6 @@
 /* define if we have colord */
 /* #undef HAVE_COLORD */
 
-/* Define to 1 if you have the <crt_externs.h> header file. */
-/* #undef HAVE_CRT_EXTERNS_H */
-
 /* Define to 1 if you have the `dcgettext' function. */
 #define HAVE_DCGETTEXT 1
 
@@ -248,9 +245,6 @@
 /* Define if _NL_TIME_FIRST_WEEKDAY is available */
 /* #undef HAVE__NL_TIME_FIRST_WEEKDAY */
 
-/* Define to 1 if you have the `_NSGetEnviron' function. */
-/* #undef HAVE__NSGETENVIRON */
-
 /* Define to the sub-directory in which libtool stores uninstalled libraries.
    */
 #define LT_OBJDIR ".libs/"
diff --git a/configure.ac b/configure.ac
index 6acd65e9b1cbf21197cfd51b9542eb47609eb9f6..6888a37578fbcb2d5b9ee0ccef3c557853d372d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,10 +852,6 @@ AC_CHECK_LIB(m,round,,)
 AC_CHECK_FUNCS(round rint nearbyint sincos exp2 log2 trunc)
 AC_CHECK_DECLS([isnan, isinf], [], [], [[#include <math.h>]])
 
-# Checks for gdkspawn
-AC_CHECK_HEADERS(crt_externs.h)
-AC_CHECK_FUNCS(_NSGetEnviron)
-
 AC_MSG_CHECKING(whether to build dynamic modules)
 
 AC_ARG_ENABLE(modules,