diff --git a/arch/aarch64/bits/alltypes.h.in b/arch/aarch64/bits/alltypes.h.in
index ab2c6a26..60973f6a 100644
--- a/arch/aarch64/bits/alltypes.h.in
+++ b/arch/aarch64/bits/alltypes.h.in
@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 1234
 #endif
 
+#define __LONG_MAX 0x7fffffffffffffffL
+
 #ifndef __cplusplus
 TYPEDEF unsigned wchar_t;
 #endif
diff --git a/arch/aarch64/bits/limits.h b/arch/aarch64/bits/limits.h
deleted file mode 100644
index 0226588c..00000000
--- a/arch/aarch64/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/arm/bits/alltypes.h.in b/arch/arm/bits/alltypes.h.in
index 42825bff..a48915e2 100644
--- a/arch/arm/bits/alltypes.h.in
+++ b/arch/arm/bits/alltypes.h.in
@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 1234
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 TYPEDEF unsigned wchar_t;
 #endif
diff --git a/arch/arm/bits/limits.h b/arch/arm/bits/limits.h
deleted file mode 100644
index fbc6d238..00000000
--- a/arch/arm/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/generic/bits/limits.h b/arch/generic/bits/limits.h
new file mode 100644
index 00000000..e69de29b
diff --git a/arch/i386/bits/alltypes.h.in b/arch/i386/bits/alltypes.h.in
index 95491e4b..6f634009 100644
--- a/arch/i386/bits/alltypes.h.in
+++ b/arch/i386/bits/alltypes.h.in
@@ -3,6 +3,7 @@
 #define _Reg int
 
 #define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__
diff --git a/arch/i386/bits/limits.h b/arch/i386/bits/limits.h
index c340ceb2..07743b6f 100644
--- a/arch/i386/bits/limits.h
+++ b/arch/i386/bits/limits.h
@@ -1,8 +1 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/m68k/bits/alltypes.h.in b/arch/m68k/bits/alltypes.h.in
index 75595f24..0aab9679 100644
--- a/arch/m68k/bits/alltypes.h.in
+++ b/arch/m68k/bits/alltypes.h.in
@@ -3,6 +3,7 @@
 #define _Reg int
 
 #define __BYTE_ORDER 4321
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__
diff --git a/arch/m68k/bits/limits.h b/arch/m68k/bits/limits.h
deleted file mode 100644
index fbc6d238..00000000
--- a/arch/m68k/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/microblaze/bits/alltypes.h.in b/arch/microblaze/bits/alltypes.h.in
index daea3fcb..171ce71d 100644
--- a/arch/microblaze/bits/alltypes.h.in
+++ b/arch/microblaze/bits/alltypes.h.in
@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 4321
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif
diff --git a/arch/microblaze/bits/limits.h b/arch/microblaze/bits/limits.h
deleted file mode 100644
index fbc6d238..00000000
--- a/arch/microblaze/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/mips/bits/alltypes.h.in b/arch/mips/bits/alltypes.h.in
index d5d51289..a01de176 100644
--- a/arch/mips/bits/alltypes.h.in
+++ b/arch/mips/bits/alltypes.h.in
@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 4321
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif
diff --git a/arch/mips/bits/limits.h b/arch/mips/bits/limits.h
deleted file mode 100644
index fbc6d238..00000000
--- a/arch/mips/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/mips64/bits/alltypes.h.in b/arch/mips64/bits/alltypes.h.in
index 34776f07..c05cc6fa 100644
--- a/arch/mips64/bits/alltypes.h.in
+++ b/arch/mips64/bits/alltypes.h.in
@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 4321
 #endif
 
+#define __LONG_MAX 0x7fffffffffffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif
diff --git a/arch/mips64/bits/limits.h b/arch/mips64/bits/limits.h
deleted file mode 100644
index 58698c62..00000000
--- a/arch/mips64/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX 0x7fffffffffffffffL
-#define LLONG_MAX 0x7fffffffffffffffLL
diff --git a/arch/mipsn32/bits/alltypes.h.in b/arch/mipsn32/bits/alltypes.h.in
index d5d51289..a01de176 100644
--- a/arch/mipsn32/bits/alltypes.h.in
+++ b/arch/mipsn32/bits/alltypes.h.in
@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 4321
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif
diff --git a/arch/mipsn32/bits/limits.h b/arch/mipsn32/bits/limits.h
deleted file mode 100644
index fbc6d238..00000000
--- a/arch/mipsn32/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/or1k/bits/alltypes.h.in b/arch/or1k/bits/alltypes.h.in
index a2cae2b6..f16a3763 100644
--- a/arch/or1k/bits/alltypes.h.in
+++ b/arch/or1k/bits/alltypes.h.in
@@ -3,6 +3,7 @@
 #define _Reg int
 
 #define __BYTE_ORDER 4321
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 TYPEDEF unsigned wchar_t;
diff --git a/arch/or1k/bits/limits.h b/arch/or1k/bits/limits.h
index 3a811c99..fac47aad 100644
--- a/arch/or1k/bits/limits.h
+++ b/arch/or1k/bits/limits.h
@@ -1,8 +1 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 8192
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/powerpc/bits/alltypes.h.in b/arch/powerpc/bits/alltypes.h.in
index 60c7f1ee..2730a24b 100644
--- a/arch/powerpc/bits/alltypes.h.in
+++ b/arch/powerpc/bits/alltypes.h.in
@@ -3,6 +3,7 @@
 #define _Reg int
 
 #define __BYTE_ORDER 4321
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__
diff --git a/arch/powerpc/bits/limits.h b/arch/powerpc/bits/limits.h
deleted file mode 100644
index fbc6d238..00000000
--- a/arch/powerpc/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/powerpc64/bits/alltypes.h.in b/arch/powerpc64/bits/alltypes.h.in
index 395cd7cc..0096ac9a 100644
--- a/arch/powerpc64/bits/alltypes.h.in
+++ b/arch/powerpc64/bits/alltypes.h.in
@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 1234
 #endif
 
+#define __LONG_MAX 0x7fffffffffffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif
diff --git a/arch/powerpc64/bits/limits.h b/arch/powerpc64/bits/limits.h
deleted file mode 100644
index 0226588c..00000000
--- a/arch/powerpc64/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/riscv64/bits/alltypes.h.in b/arch/riscv64/bits/alltypes.h.in
index 54dfc7db..b9ab6633 100644
--- a/arch/riscv64/bits/alltypes.h.in
+++ b/arch/riscv64/bits/alltypes.h.in
@@ -3,6 +3,7 @@
 #define _Reg long
 
 #define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffffffffffL
 
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
diff --git a/arch/riscv64/bits/limits.h b/arch/riscv64/bits/limits.h
deleted file mode 100644
index 0226588c..00000000
--- a/arch/riscv64/bits/limits.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/s390x/bits/alltypes.h.in b/arch/s390x/bits/alltypes.h.in
index 1f392b1a..64150fcf 100644
--- a/arch/s390x/bits/alltypes.h.in
+++ b/arch/s390x/bits/alltypes.h.in
@@ -3,6 +3,7 @@
 #define _Reg long
 
 #define __BYTE_ORDER 4321
+#define __LONG_MAX 0x7fffffffffffffffL
 
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
diff --git a/arch/s390x/bits/limits.h b/arch/s390x/bits/limits.h
index 86ef7663..07743b6f 100644
--- a/arch/s390x/bits/limits.h
+++ b/arch/s390x/bits/limits.h
@@ -1,8 +1 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/sh/bits/alltypes.h.in b/arch/sh/bits/alltypes.h.in
index 5952e9e6..9656416e 100644
--- a/arch/sh/bits/alltypes.h.in
+++ b/arch/sh/bits/alltypes.h.in
@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 1234
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__
 TYPEDEF __WCHAR_TYPE__ wchar_t;
diff --git a/arch/sh/bits/limits.h b/arch/sh/bits/limits.h
index c340ceb2..07743b6f 100644
--- a/arch/sh/bits/limits.h
+++ b/arch/sh/bits/limits.h
@@ -1,8 +1 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/x32/bits/alltypes.h.in b/arch/x32/bits/alltypes.h.in
index 5d7a1279..0c2dd106 100644
--- a/arch/x32/bits/alltypes.h.in
+++ b/arch/x32/bits/alltypes.h.in
@@ -3,6 +3,7 @@
 #define _Reg long long
 
 #define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__
diff --git a/arch/x32/bits/limits.h b/arch/x32/bits/limits.h
index c340ceb2..07743b6f 100644
--- a/arch/x32/bits/limits.h
+++ b/arch/x32/bits/limits.h
@@ -1,8 +1 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/arch/x86_64/bits/alltypes.h.in b/arch/x86_64/bits/alltypes.h.in
index b815b438..d104cb07 100644
--- a/arch/x86_64/bits/alltypes.h.in
+++ b/arch/x86_64/bits/alltypes.h.in
@@ -3,6 +3,7 @@
 #define _Reg long
 
 #define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffffffffffL
 
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
diff --git a/arch/x86_64/bits/limits.h b/arch/x86_64/bits/limits.h
index 86ef7663..07743b6f 100644
--- a/arch/x86_64/bits/limits.h
+++ b/arch/x86_64/bits/limits.h
@@ -1,8 +1 @@
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL
diff --git a/include/limits.h b/include/limits.h
index 02c2139d..1499eaae 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -3,9 +3,7 @@
 
 #include <features.h>
 
-/* Most limits are system-specific */
-
-#include <bits/limits.h>
+#include <bits/alltypes.h> /* __LONG_MAX */
 
 /* Support signed or unsigned plain-char */
 
@@ -17,8 +15,6 @@
 #define CHAR_MAX 127
 #endif
 
-/* Some universal constants... */
-
 #define CHAR_BIT 8
 #define SCHAR_MIN (-128)
 #define SCHAR_MAX 127
@@ -30,8 +26,10 @@
 #define INT_MAX  0x7fffffff
 #define UINT_MAX 0xffffffffU
 #define LONG_MIN (-LONG_MAX-1)
+#define LONG_MAX __LONG_MAX
 #define ULONG_MAX (2UL*LONG_MAX+1)
 #define LLONG_MIN (-LLONG_MAX-1)
+#define LLONG_MAX  0x7fffffffffffffffLL
 #define ULLONG_MAX (2ULL*LLONG_MAX+1)
 
 #define MB_LEN_MAX 4
@@ -39,6 +37,8 @@
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
+#include <bits/limits.h>
+
 #define PIPE_BUF 4096
 #define FILESIZEBITS 64
 #define NAME_MAX 255
@@ -53,6 +53,12 @@
 #define TTY_NAME_MAX 32
 #define HOST_NAME_MAX 255
 
+#if LONG_MAX == 0x7fffffffL
+#define LONG_BIT 32
+#else
+#define LONG_BIT 64
+#endif
+
 /* Implementation choices... */
 
 #define PTHREAD_KEYS_MAX 128