--- src/CMakeLists.txt.orig	2017-10-15 22:35:17.000000000 +0200
+++ src/CMakeLists.txt	2017-10-20 09:13:13.740336950 +0200
@@ -118,6 +118,19 @@
     message(FATAL_ERROR "pkg-config required but not found")
 endif (PKG_CONFIG_FOUND)
 
+include (CheckFunctionExists)
+check_function_exists(random_r HAVE_RANDOM_R)
+
+# musl systems don’t have random_r() and also need argp-standalone
+if (NOT HAVE_RANDOM_R)
+	find_library (ARGP_LIB argp REQUIRED)
+	if (ARGP_LIB)
+		message(STATUS "Found argp")
+	else()
+		message(FATAL_ERROR "argp required but not found")
+	endif()
+endif()
+
 # libz
 set (CMAKE_REQUIRED_LIBRARIES z)
 check_c_source_compiles (
@@ -497,6 +510,10 @@
 
 target_link_libraries (yoshimi ${ExternLibraries})
 
+if (NOT HAVE_RANDOM_R)
+	target_link_libraries (yoshimi ${ARGP_LIB})
+endif()
+
 install (TARGETS yoshimi RUNTIME DESTINATION bin)
 
 install (DIRECTORY ../banks DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/yoshimi