--- a/lib/libv4lconvert/libv4lsyscall-priv.h
+++ b/lib/libv4lconvert/libv4lsyscall-priv.h
@@ -35,18 +35,23 @@
    which is broken on some systems and doesn't include them itself :( */
 
 #ifdef linux
+#define __NEED_off_t
 #include <sys/time.h>
 #include <syscall.h>
 #include <linux/types.h>
 #include <linux/ioctl.h>
 /* On 32 bits archs we always use mmap2, on 64 bits archs there is no mmap2 */
 #ifdef __NR_mmap2
+#undef SYS_mmap2
 #define	SYS_mmap2 __NR_mmap2
 #define	MMAP2_PAGE_SHIFT 12
 #else
 #define	SYS_mmap2 SYS_mmap
 #define	MMAP2_PAGE_SHIFT 0
 #endif
+#if !(defined(__UCLIBC__) || defined(__GLIBC__))
+typedef off_t __off_t;
+#endif
 #endif
 
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
--- a/lib/libv4l1/v4l1compat.c
+++ b/lib/libv4l1/v4l1compat.c
@@ -62,7 +62,7 @@ LIBV4L_PUBLIC int open(const char *file,
 	return fd;
 }
 
-#ifdef linux
+#if defined(linux) && (defined(__GLIBC__) || defined(__UCLIBC__))
 LIBV4L_PUBLIC int open64(const char *file, int oflag, ...)
 {
 	int fd;
@@ -94,7 +94,11 @@ LIBV4L_PUBLIC int dup(int fd)
 	return v4l1_dup(fd);
 }
 
+#ifdef HAVE_POSIX_IOCTL
+LIBV4L_PUBLIC int ioctl(int fd, int request, ...)
+#else
 LIBV4L_PUBLIC int ioctl(int fd, unsigned long int request, ...)
+#endif
 {
 	void *arg;
 	va_list ap;
@@ -112,12 +116,12 @@ LIBV4L_PUBLIC ssize_t read(int fd, void
 }
 
 LIBV4L_PUBLIC void *mmap(void *start, size_t length, int prot, int flags, int fd,
-		__off_t offset)
+		off_t offset)
 {
 	return v4l1_mmap(start, length, prot, flags, fd, offset);
 }
 
-#ifdef linux
+#if defined(linux) && (defined(__GLIBC__) || defined(__UCLIBC__))
 LIBV4L_PUBLIC void *mmap64(void *start, size_t length, int prot, int flags, int fd,
 		__off64_t offset)
 {
--- a/lib/libv4l2/v4l2convert.c
+++ b/lib/libv4l2/v4l2convert.c
@@ -86,7 +86,7 @@ LIBV4L_PUBLIC int open(const char *file,
 	return fd;
 }
 
-#ifdef linux
+#if defined(linux) && (defined(__GLIBC__) || defined(__UCLIBC__))
 LIBV4L_PUBLIC int open64(const char *file, int oflag, ...)
 {
 	int fd;
@@ -121,7 +121,11 @@ LIBV4L_PUBLIC int dup(int fd)
 	return v4l2_dup(fd);
 }
 
+#ifdef HAVE_POSIX_IOCTL
+LIBV4L_PUBLIC int ioctl(int fd, int request, ...)
+#else
 LIBV4L_PUBLIC int ioctl(int fd, unsigned long int request, ...)
+#endif
 {
 	void *arg;
 	va_list ap;
@@ -144,7 +148,7 @@ LIBV4L_PUBLIC void *mmap(void *start, si
 	return v4l2_mmap(start, length, prot, flags, fd, offset);
 }
 
-#ifdef linux
+#if defined(linux) && (defined(__GLIBC__) || defined(__UCLIBC__))
 LIBV4L_PUBLIC void *mmap64(void *start, size_t length, int prot, int flags, int fd,
 		__off64_t offset)
 {