diff --git a/backward.hpp b/backward.hpp
index 33cb0ce..413d507 100644
--- a/backward.hpp
+++ b/backward.hpp
@@ -611,7 +611,7 @@ template <typename TAG>
 class StackTraceImpl {
 public:
 	size_t size() const { return 0; }
-	Trace operator[](size_t) { return Trace(); }
+	Trace operator[](size_t) const { return Trace(); }
 	size_t load_here(size_t=0) { return 0; }
 	size_t load_from(void*, size_t=0) { return 0; }
 	size_t thread_id() const { return 0; }
@@ -1686,7 +1686,7 @@ public:
 
 		Dl_info symbol_info;
 		int dladdr_result = 0;
-#ifndef __ANDROID__
+#if defined(__GLIBC__)
 		link_map *link_map;
 		// We request the link map so we can get information about offsets
 		dladdr_result = dladdr1(trace.addr, &symbol_info,
@@ -1742,7 +1742,7 @@ public:
 			return trace; // sad, we couldn't load the object :(
 		}
 
-#ifndef __ANDROID__
+#if defined(__GLIBC__)
 		// Convert the address to a module relative one by looking at
 		// the module's loading address in the link map
 		Dwarf_Addr address = reinterpret_cast<uintptr_t>(trace.addr) -
diff --git a/test/_test_main.cpp b/test/_test_main.cpp
index 829bfcd..ebaef49 100644
--- a/test/_test_main.cpp
+++ b/test/_test_main.cpp
@@ -24,15 +24,21 @@
 #include "test.hpp"
 #include <cstdio>
 #include <cstdlib>
-#ifndef __APPLE__
-#include <error.h>
-#endif
 #include <unistd.h>
 #include <sys/wait.h>
 
-#ifdef __APPLE__
+#if defined(__has_include) && __has_include(<error.h>)
+#include <error.h>
+#else
 #include <stdarg.h>
 
+#ifndef __APPLE__
+// N.B.  getprogname() is an Apple/BSD-ism.
+// program_invocation_name is a GLIBC-ism, but it's also
+//  supported by libmusl.
+#define getprogname() program_invocation_name
+#endif
+
 void error(int status, int errnum, const char *format, ...) {
 	fflush(stdout);
 	fprintf(stderr, "%s: ", getprogname());