diff --git a/libgweather/meson.build b/libgweather/meson.build
index 07f657b992d809da913632275e820a0067b3ea7a..a32ae4c4acd90b5d680ce45c5d282982f2014a22 100644
--- a/libgweather/meson.build
+++ b/libgweather/meson.build
@@ -57,6 +57,10 @@ config_h.set_quoted('G_LOG_DOMAIN', 'GWeather')
 config_h.set_quoted('GWEATHER_BIN_LOCATION_DIR', pkglibdir)
 config_h.set_quoted('LIBGWEATHER_VERSION', meson.project_version())
 
+if c_compiler.has_header('alloca.h')
+  config_h.set('HAVE_ALLOCA_H', 1)
+endif
+
 if c_compiler.has_member('struct tm', 'tm_gmtoff', prefix: '#include <time.h>')
   config_h.set('HAVE_TM_TM_GMOFF', 1)
 endif
diff --git a/libgweather/third-party/kdtree.c b/libgweather/third-party/kdtree.c
index 6d329d8d317c47278c67b54720872789f3283891..c54bf2302ef96303beec30bbed8080f7be42629e 100644
--- a/libgweather/third-party/kdtree.c
+++ b/libgweather/third-party/kdtree.c
@@ -26,9 +26,7 @@ OF SUCH DAMAGE.
 */
 /* single nearest neighbor search written by Tamas Nepusz <tamas@cs.rhul.ac.uk> */
 
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
+#include "config.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -36,6 +34,10 @@ OF SUCH DAMAGE.
 #include <math.h>
 #include "kdtree.h"
 
+#ifdef HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
+
 #if defined(WIN32) || defined(__WIN32__)
 #include <malloc.h>
 #endif