diff --git a/base/usr/include/locale.h b/base/usr/include/locale.h
index 85ebc71a..805aab91 100644
--- a/base/usr/include/locale.h
+++ b/base/usr/include/locale.h
@@ -1,7 +1,5 @@
 #pragma once
 
-#warning Need locale.h
-
 #define LC_ALL      0
 #define LC_COLLATE  1
 #define LC_CTYPE    2
@@ -10,5 +8,26 @@
 #define LC_TIME     5
 #define LC_MESSAGES 6
 
+struct lconv {
+    char * decimal_point;
+    char * thousands_sep;
+    char * grouping;
+    char * int_curr_symbol;
+    char * currency_symbol;
+    char * mon_decimal_point;
+    char * mon_thousands_sep;
+    char * mon_grouping;
+    char * positive_sign;
+    char * negative_sign;
+    char   int_frac_digits;
+    char   frac_digits;
+    char   p_cs_precedes;
+    char   p_sep_by_space;
+    char   n_cs_precedes;
+    char   n_sep_by_space;
+    char   p_sign_posn;
+    char   n_sign_posn;
+};
 
-#define setlocale(...) (NULL)
+extern struct lconv * localeconv(void);
+extern char * setlocale(int category, const char *locale);
diff --git a/base/usr/include/stdio.h b/base/usr/include/stdio.h
index fe85d286..ce18ae75 100644
--- a/base/usr/include/stdio.h
+++ b/base/usr/include/stdio.h
@@ -33,6 +33,7 @@ extern size_t vasprintf(char ** buf, const char *fmt, va_list args);
 extern int    sprintf(char *buf, const char *fmt, ...);
 extern int    fprintf(FILE *stream, char *fmt, ...);
 extern int    printf(char *fmt, ...);
+extern int snprintf(char * buf, size_t size, const char * fmt, ...);
 
 extern int puts(const char *s);
 extern int fputs(const char *s, FILE *stream);
diff --git a/base/usr/include/stdlib.h b/base/usr/include/stdlib.h
index 913a3925..8d04bf98 100644
--- a/base/usr/include/stdlib.h
+++ b/base/usr/include/stdlib.h
@@ -29,6 +29,7 @@ extern int rand(void);
 
 #define RAND_MAX 0x7FFFFFFF
 
+extern void abort(void);
 
 #define EXIT_SUCCESS 0
 #define EXIT_FAILURE 1
diff --git a/libc/locale/localeconv.c b/libc/locale/localeconv.c
new file mode 100644
index 00000000..8ebe01d8
--- /dev/null
+++ b/libc/locale/localeconv.c
@@ -0,0 +1,26 @@
+#include <locale.h>
+
+static struct lconv _en_US = {
+    .decimal_point = ".",
+    .thousands_sep = ",",
+    .grouping = "\x03\x03",
+    .int_curr_symbol = "USD ",
+    .currency_symbol = "$",
+    .mon_decimal_point = ".",
+    .mon_thousands_sep = ",",
+    .mon_grouping = "\x03\x03",
+    .positive_sign = "+",
+    .negative_sign = "-",
+    .int_frac_digits = 2,
+    .frac_digits = 2,
+    .p_cs_precedes = 1,
+    .p_sep_by_space = 0,
+    .n_cs_precedes = 1,
+    .n_sep_by_space = 0,
+    .p_sign_posn = 1,
+    .n_sign_posn = 1,
+};
+
+struct lconv * localeconv(void) {
+    return &_en_US;
+}
diff --git a/libc/locale/setlocale.c b/libc/locale/setlocale.c
new file mode 100644
index 00000000..9a4112dc
--- /dev/null
+++ b/libc/locale/setlocale.c
@@ -0,0 +1,7 @@
+#include <stdlib.h>
+#include <locale.h>
+
+char * setlocale(int category, const char *locale) {
+    return NULL; /* Unsupported */
+}
+
diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c
index fec3c300..5edf367d 100644
--- a/libc/stdio/printf.c
+++ b/libc/stdio/printf.c
@@ -240,4 +240,14 @@ int sprintf(char * buf, const char *fmt, ...) {
 	return out;
 }
 
+int snprintf(char * buf, size_t size, const char * fmt, ...) {
+	/* XXX This is bad. */
+	(void)size;
+	va_list args;
+	va_start(args, fmt);
+	int out = xvasprintf(buf, fmt, args);
+	va_end(args);
+	return out;
+}
+
 
diff --git a/libc/stdlib/abort.c b/libc/stdlib/abort.c
new file mode 100644
index 00000000..0da7cb08
--- /dev/null
+++ b/libc/stdlib/abort.c
@@ -0,0 +1,7 @@
+#include <stdlib.h>
+#include <syscall.h>
+
+void abort(void) {
+	syscall_exit(-1);
+	__builtin_unreachable();
+}