diff -Naur newsbeuter-2.9.orig/src/utils.cpp newsbeuter-2.9/src/utils.cpp
--- newsbeuter-2.9.orig/src/utils.cpp	2015-02-19 11:56:59.000000000 +0100
+++ newsbeuter-2.9/src/utils.cpp	2016-05-30 22:48:05.751627034 +0200
@@ -37,6 +47,18 @@
 #include <openssl/crypto.h>
 #endif
 
+#ifdef __ANDROID__
+
+# define F_ULOCK 0	/* Unlock a previously locked region.  */
+# define F_LOCK  1	/* Lock a region for exclusive use.  */
+# define F_TLOCK 2	/* Test and lock a region for exclusive use.  */
+# define F_TEST  3	/* Test a region for other processes locks.  */
+
+inline int lockf(int fd, int cmd, off_t ignored_len) {
+    return flock(fd, cmd);
+}
+#endif
+
 namespace newsbeuter {
 
 std::vector<std::string> utils::tokenize_quoted(const std::string& str, std::string delimiters) {