diff --git mlibc-clean/options/ansi/generic/stdio.cpp mlibc-workdir/options/ansi/generic/stdio.cpp
index a5e177a..91a9db7 100644
--- mlibc-clean/options/ansi/generic/stdio.cpp
+++ mlibc-workdir/options/ansi/generic/stdio.cpp
@@ -8,6 +8,7 @@
 #include <wchar.h>
 #include <ctype.h>
 #include <limits.h>
+#include <math.h>
 
 #include <abi-bits/fcntl.h>
 
@@ -348,6 +349,20 @@ static void store_int(void *dest, unsigned int size, unsigned long long i) {
 	}
 }
 
+static void store_float(void *dest, unsigned int size, long double f) {
+	switch(size) {
+		case SCANF_TYPE_LL:
+			*(long double *)dest = f;
+			break;
+		case SCANF_TYPE_L:
+			*(double *)dest = f;
+			break;
+		default:
+			*(float *)dest = f;
+			break;
+	}
+}
+
 template<typename H>
 static int do_scanf(H &handler, const char *fmt, __builtin_va_list args) {
 	#define NOMATCH_CHECK(cond) ({ if(cond) return match_count; }) // if cond is true, matching error
@@ -476,6 +491,141 @@ static int do_scanf(H &handler, const char *fmt, __builtin_va_list args) {
 		}
 
 		switch (*fmt) {
+			case 'a':
+			case 'A':
+			case 'E':
+			case 'e':
+			case 'G':
+			case 'g':
+			case 'F':
+			case 'f': {
+				bool is_negative = false;
+				long double divisor = 10;
+				long double result = 0;
+				int count = 0;
+				bool dot = false;
+				char c = handler.look_ahead();
+				EOF_CHECK(c == '\0');
+
+				if((c == '-')) {
+					handler.consume();
+					is_negative = true;
+					c = handler.look_ahead();
+				}
+				
+				if((c == '+')) {
+					handler.consume();
+					c = handler.look_ahead();
+				}
+
+				// nan?
+				if(tolower(c) == 'n') {
+					handler.consume();
+					c = handler.look_ahead();
+					if(tolower(c) != 'a')
+						return match_count;
+
+					handler.consume();
+					c = handler.look_ahead();
+					if(tolower(c) != 'n')
+						return match_count;
+
+					handler.consume();
+					if(dest)
+						store_float(dest, type, NAN);
+
+					continue;
+				}
+
+				// inf?
+				if(tolower(c) == 'i') {
+					handler.consume();
+					c = handler.look_ahead();
+					size_t i;
+					for(i = 0; i < strlen("nfinity"); ++i) {
+						if (tolower(c) != "nfinity"[i])
+							break;
+						handler.consume();
+						c = handler.look_ahead();
+					}
+
+					NOMATCH_CHECK(i != 2 && i != 8);
+
+					if(dest)
+						store_float(dest, type, is_negative ? -INFINITY : INFINITY);
+
+					continue;
+				}
+
+				// check if hexadecimal
+				if (c == '0') {
+					handler.consume();
+					c = handler.look_ahead();
+					if (tolower(c) == 'x') {
+						mlibc::infoLogger() << "mlibc: no support for hexadecimal floats on scanf" << frg::endlog;
+						return match_count;
+					}
+
+					++count;
+				}
+
+				while(isdigit(c) || (dot == false && c == '.')) {
+					handler.consume();
+					if(c == '.') {
+						dot = true;
+						c = handler.look_ahead();
+						continue;
+					}
+
+					long double character_value = c - '0';
+
+					if(dot) {
+						result = result + character_value / divisor;
+						divisor *= 10;
+					} else {
+						result = result * 10 + character_value;
+					}
+
+					++count;
+					c = handler.look_ahead();
+				}
+
+				NOMATCH_CHECK(count == 0);
+
+				result = is_negative ? -result : result;
+
+				// check for scientific notation
+				if (tolower(c) == 'e') {
+					handler.consume();
+					c = handler.look_ahead();
+					bool negative_exponent = false;
+					if(c == '+') {
+						handler.consume();
+						c = handler.look_ahead();
+					}
+
+					if(c == '-') {
+						negative_exponent = true;
+						handler.consume();
+						c = handler.look_ahead();
+					}
+
+					int exponent = 0;
+
+					while(isdigit(c)) {
+						handler.consume();
+						int value = c - '0';
+						exponent = exponent * 10 + value;
+						c = handler.look_ahead();
+					}
+
+					result = result * powl(10, negative_exponent ? -exponent : exponent);
+				}
+
+				if (dest)
+					store_float(dest, type, result);
+				break;
+			}
 			case 'd':
 			case 'u':
 				base = 10;
diff --git mlibc-clean/options/glibc/generic/execinfo.cpp mlibc-workdir/options/glibc/generic/execinfo.cpp
index 6b6a9c0..e1a37e2 100644
--- mlibc-clean/options/glibc/generic/execinfo.cpp
+++ mlibc-workdir/options/glibc/generic/execinfo.cpp
@@ -2,6 +2,7 @@
 
 #include <bits/ensure.h>
 #include <mlibc/debug.hpp>
+#include <errno.h>
 
 int backtrace(void **, int) {
 	mlibc::infoLogger() << "mlibc: backtrace() is a stub!" << frg::endlog;
@@ -9,8 +10,9 @@ int backtrace(void **, int) {
 }
 
 char **backtrace_symbols(void *const *, int) {
-	__ensure(!"Not implemented");
-	__builtin_unreachable();
+	mlibc::infoLogger() << "mlibc: backtrace() is a stub!" << frg::endlog;
+	errno = ENOSYS;
+	return NULL;
 }
 
 void backtrace_symbols_fd(void *const *, int, int) {