diff --git a/usr/dash/config.h b/usr/dash/config.h
index 35230c7..9757009 100644
--- a/usr/dash/config.h
+++ b/usr/dash/config.h
@@ -81,7 +81,7 @@
 #define HAVE_STRTOUMAX 1
 
 /* Define to 1 if you have the `sysconf' function. */
-/* #undef HAVE_SYSCONF */
+#define HAVE_SYSCONF 1
 
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #define HAVE_SYS_STAT_H 1
diff --git a/usr/include/sys/sysconf.h b/usr/include/sys/sysconf.h
new file mode 100644
index 0000000..13ababc
--- /dev/null
+++ b/usr/include/sys/sysconf.h
@@ -0,0 +1,40 @@
+/*
+ * sys/sysconf.h
+ *
+ * sysconf() macros and demultiplex
+ * This file is included in <unistd.h>
+ *
+ * Add things here as needed, we don't really want to add things wildly.
+ * For things that require a lot of code, create an out-of-line function
+ * and put it in a .c file in the sysconf directory.
+ */
+
+#ifndef _SYS_SYSCONF_H
+#define _SYS_SYSCONF_H
+
+#ifndef _UNISTD_H
+# include <unistd.h>
+#endif
+#include <errno.h>
+
+enum sysconf {
+	_SC_PAGESIZE = 1,
+};
+
+__extern long sysconf(int);
+
+__must_inline long __sysconf_inline(int __val)
+{
+	switch (__val) {
+	case _SC_PAGESIZE:
+		return getpagesize();
+	default:
+		errno = EINVAL;
+		return -1;
+	}
+}
+
+#define sysconf(x) \
+	(__builtin_constant_p(x) ? __sysconf_inline(x) : sysconf(x))
+
+#endif /* _SYS_SYSCONF_H */
diff --git a/usr/include/unistd.h b/usr/include/unistd.h
index f0e19c2..d425df8 100644
--- a/usr/include/unistd.h
+++ b/usr/include/unistd.h
@@ -144,13 +144,13 @@
 __extern int isatty(int);
 
 __extern unsigned int __page_size;
-static __inline__ int getpagesize(void)
+__must_inline int getpagesize(void)
 {
 	return __page_size;
 }
 
 __extern unsigned int __page_shift;
-static __inline__ int __getpageshift(void)
+__must_inline int __getpageshift(void)
 {
 	return __page_shift;
 }
@@ -162,4 +162,7 @@
 #define STDOUT_FILENO	1
 #define STDERR_FILENO	2
 
+/* This #include must be at the end */
+#include <sys/sysconf.h>
+
 #endif				/* _UNISTD_H */
diff --git a/usr/klibc/Kbuild b/usr/klibc/Kbuild
index 2bef9ca..da1dce0 100644
--- a/usr/klibc/Kbuild
+++ b/usr/klibc/Kbuild
@@ -70,7 +70,8 @@
 	  stdio/fread.o stdio/fwrite.o stdio/fflush.o \
 	  stdio/ungetc.o stdio/fgetc.o \
 	  stdio/fseek.o stdio/ftell.o stdio/rewind.o \
-	  stdio/fileno.o stdio/feof.o stdio/ferror.o
+	  stdio/fileno.o stdio/feof.o stdio/ferror.o \
+	  sysconf/sysconf.o
 
 klib-$(CONFIG_KLIBC_ERRLIST) += errlist.o
 
diff --git a/usr/klibc/sysconf/sysconf.c b/usr/klibc/sysconf/sysconf.c
new file mode 100644
index 0000000..0e21beb
--- /dev/null
+++ b/usr/klibc/sysconf/sysconf.c
@@ -0,0 +1,8 @@
+#include <sys/sysconf.h>
+
+#undef sysconf
+
+long sysconf(int val)
+{
+	return __sysconf_inline(val);
+}