--- ./src/notify.hxx.orig
+++ ./src/notify.hxx
@@ -28,7 +28,7 @@
 	Cond cond;
 	bool pending;
 
-#if !defined(WIN32) && !defined(__NetBSD__) && !defined(__BIONIC__)
+#if !defined(WIN32) && !defined(__NetBSD__) && !defined(__BIONIC__) && defined(__GLIBC__)
 	constexpr
 #endif
 	notify():pending(false) {}
--- ./src/thread/PosixCond.hxx.orig
+++ ./src/thread/PosixCond.hxx
@@ -41,7 +41,7 @@
 	pthread_cond_t cond;
 
 public:
-#if defined(__NetBSD__) || defined(__BIONIC__)
+#if defined(__NetBSD__) || defined(__BIONIC__) || !defined(__GLIBC__)
 	/* NetBSD's PTHREAD_COND_INITIALIZER is not compatible with
 	   "constexpr" */
 	PosixCond() {
--- ./src/thread/PosixMutex.hxx.orig
+++ ./src/thread/PosixMutex.hxx
@@ -41,7 +41,7 @@
 	pthread_mutex_t mutex;
 
 public:
-#if defined(__NetBSD__) || defined(__BIONIC__)
+#if defined(__NetBSD__) || defined(__BIONIC__) || !defined(__GLIBC__)
 	/* NetBSD's PTHREAD_MUTEX_INITIALIZER is not compatible with
 	   "constexpr" */
 	PosixMutex() {