diff --git a/src/core/mormot.core.os.pas b/src/core/mormot.core.os.pas
index 4b3f272db..5920abff4 100644
--- a/src/core/mormot.core.os.pas
+++ b/src/core/mormot.core.os.pas
@@ -2618,6 +2618,18 @@ function FileTimeToUnixMSTime(const FT: TFileTime): TUnixMSTime;
 
 {$else}
 
+const
+  /// allow to assign proper signed symbol table name for a libc.so.6 method
+  {$ifdef OSLINUXX64}
+  LIBC_SUFFIX = '@GLIBC_2.2.5';
+  {$else}
+  {$ifdef OSLINUXX86}
+  LIBC_SUFFIX = '@GLIBC_2.0';
+  {$else}
+  LIBC_SUFFIX = ''; // no suffix seems needed outside of Intel/AMD systems
+  {$endif OSLINUXX86}
+  {$endif OSLINUXX64}
+
 type
   /// system-specific type returned by FileAge(): UTC 64-bit Epoch on POSIX
   TFileAge = TUnixTime;
diff --git a/src/core/mormot.core.os.posix.inc b/src/core/mormot.core.os.posix.inc
index 94342af28..3ae269499 100644
--- a/src/core/mormot.core.os.posix.inc
+++ b/src/core/mormot.core.os.posix.inc
@@ -737,10 +737,10 @@ const
 //   GetTickCount64 fpc    2 494 563 op/sec
 //   GetTickCount64 libc 119 919 893 op/sec
 function clock_gettime(clk_id: clockid_t; tp: ptimespec): cint;
-  cdecl external clib name 'clock_gettime';
+  cdecl external clib name 'clock_gettime' + LIBC_SUFFIX;
 
 function gettimeofday(tp: ptimeval; tzp: ptimezone): cint;
-  cdecl external clib name 'gettimeofday';
+  cdecl external clib name 'gettimeofday' + LIBC_SUFFIX;
 
 {$endif OSBSD}
 
@@ -2870,20 +2870,20 @@ type
 
 // retrieve information of a given user by name
 function getpwnam(name: PAnsiChar): PPasswd;
-  cdecl external clib name 'getpwnam';
+  cdecl external clib name 'getpwnam' + LIBC_SUFFIX;
 
 // sets the supplementary group IDs for the calling process
 function setgroups(n: size_t; groups: PGid): integer;
-  cdecl external clib name 'setgroups';
+  cdecl external clib name 'setgroups' + LIBC_SUFFIX;
 
 function setuid(uid: TUid): integer;
-  cdecl external clib name 'setuid';
+  cdecl external clib name 'setuid' + LIBC_SUFFIX;
 function setgid(gid: TGid): integer;
-  cdecl external clib name 'setgid';
+  cdecl external clib name 'setgid' + LIBC_SUFFIX;
 
 // changes the root directory of the calling process
 function chroot(rootpath: PAnsiChar): integer;
-  cdecl external clib name 'chroot';
+  cdecl external clib name 'chroot' + LIBC_SUFFIX;
 
 function DropPriviledges(const UserName: RawUtf8): boolean;
 var
@@ -3301,13 +3301,13 @@ end;
 
 {$else}
 function getpagesize: integer;
-  cdecl external clib name 'getpagesize';
+  cdecl external clib name 'getpagesize' + LIBC_SUFFIX;
 {$endif OSANDROID}
 
 {$ifdef OSLINUX}
 
 function get_nprocs: integer;
-  cdecl external clib name 'get_nprocs';
+  cdecl external clib name 'get_nprocs' + LIBC_SUFFIX;
 
 procedure SetLinuxDistrib(const release: RawUtf8);
 var
diff --git a/src/lib/mormot.lib.static.pas b/src/lib/mormot.lib.static.pas
index 3191d6c12..0dcb5ee5d 100644
--- a/src/lib/mormot.lib.static.pas
+++ b/src/lib/mormot.lib.static.pas
@@ -681,7 +681,7 @@ function setlocale(category: integer; locale: PAnsiChar): PAnsiChar; cdecl;
   // NetBSD has a new setlocale function defined in /usr/include/locale.h
   external 'c' name '__setlocale_mb_len_max_32';
   {$else}
-  external 'c' name 'setlocale'; // regular libc POSIX call
+  external 'c' name 'setlocale' + LIBC_SUFFIX; // regular libc POSIX call
   {$endif NETBSD}
 {$endif OSWINDOWS}
 
diff --git a/src/mormot.commit.inc b/src/mormot.commit.inc
index 9c228fdb5..f4909a729 100644
--- a/src/mormot.commit.inc
+++ b/src/mormot.commit.inc
@@ -1 +1 @@
-'2.1.5681'
+'2.1.5682'
diff --git a/src/mormot.defines.inc b/src/mormot.defines.inc
index 5cb4d84a0..61b3ac668 100644
--- a/src/mormot.defines.inc
+++ b/src/mormot.defines.inc
@@ -261,6 +261,7 @@
         {$define FPCLINUX}
         {$define OSLINUXANDROID}
         {$ifdef CPUX64}
+          {$define OSLINUXINTEL}
           {$define OSLINUXX64}
         {$endif CPUX64}
       {$else}
@@ -271,6 +272,8 @@
           {$define OSLINUXANDROID}
           {$define NOPATCHRTL}  // don't mess with asm stuff
           {$ifdef CPUX86}
+            {$define OSLINUXINTEL}
+            {$define OSLINUXX86}
             {$define FPC_PIC}
           {$endif CPUX86}
           {$ifdef CPUAARCH64}
diff --git a/src/net/mormot.net.sock.pas b/src/net/mormot.net.sock.pas
index 49cb31db3..83c982985 100644
--- a/src/net/mormot.net.sock.pas
+++ b/src/net/mormot.net.sock.pas
@@ -493,7 +493,6 @@ function GetIPAddressesText(const Sep: RawUtf8 = ' ';
 // - may be set to force detection after HW configuration change
 procedure MacIPAddressFlush;
 
-
 type
   /// interface name/address pairs as returned by GetMacAddresses
   TMacAddress = record
diff --git a/src/net/mormot.net.sock.posix.inc b/src/net/mormot.net.sock.posix.inc
index 93933edf6..2fd5e2c15 100644
--- a/src/net/mormot.net.sock.posix.inc
+++ b/src/net/mormot.net.sock.posix.inc
@@ -174,7 +174,8 @@ type
 {$ifdef SOCKDIRECTSYSCALL}
 
 function gethostbyname(name: PAnsiChar): PHostEnt; cdecl;
-  external clib name 'gethostbyname'; // no syscall available from FPC
+  external clib name 'gethostbyname' + LIBC_SUFFIX;
+  // no syscall available from FPC -> use libc wrapper
 
 function socket(af, struct, protocol: integer): integer; inline;
 begin
@@ -210,7 +211,8 @@ end;
 
 function getnameinfo(addr: PSockAddr; namelen: tsocklen; host: PAnsiChar;
    hostlen: tsocklen; serv: PAnsiChar; servlen: tsocklen; flags: integer): integer; cdecl;
-  external clib name 'getnameinfo'; // no syscall available from FPC
+  external clib name 'getnameinfo' + LIBC_SUFFIX;
+  // no syscall available from FPC
 
 function bind(s: integer; addr: PSockAddr; namelen: tsocklen): integer; inline;
 begin
@@ -234,7 +236,8 @@ end;
 
 {$ifdef HASACCEPT4}
 function accept4(s: integer; addr: PSockAddr; var addrlen: tsocklen; flags: integer): integer; cdecl;
-  external clib name 'accept4'; // no syscall available from FPC
+  external clib name 'accept4';
+  // no syscall available from FPC
 {$endif HASACCEPT4}
 
 function connect(s: integer; name: PSockAddr; namelen: tsocklen): integer; inline;
@@ -282,72 +285,77 @@ end;
 // like gethostbyname() or accept4() are not available as fp* syscalls
 
 function gethostbyname(name: PAnsiChar): PHostEnt; cdecl;
-  external clib name 'gethostbyname';
+  external clib name 'gethostbyname' + LIBC_SUFFIX;
 
 function socket(af, struct, protocol: integer): integer; cdecl;
-  external clib name 'socket';
+  external clib name 'socket' + LIBC_SUFFIX;
 
 function setsockopt(s: integer; level, optname: integer;
    optval: pointer; optlen: integer): integer; cdecl;
-  external clib name 'setsockopt';
+  external clib name 'setsockopt' + LIBC_SUFFIX;
 
 function getsockopt(s: integer; level, optname: integer;
    optval: pointer; optlen: PInteger): integer; cdecl;
-  external clib name 'getsockopt';
+  external clib name 'getsockopt' + LIBC_SUFFIX;
 
 function ioctlsocket(s: integer; cmd: cardinal): integer; cdecl; varargs;
-  external clib name 'ioctl';
+  external clib name 'ioctl' + LIBC_SUFFIX;
 
 function shutdown(s: integer; how: integer): integer; cdecl;
-  external clib name 'shutdown';
+  external clib name 'shutdown' + LIBC_SUFFIX;
 
 function closesocket(s: integer): integer; cdecl;
-  external clib name 'close';
+  external clib name 'close' + LIBC_SUFFIX;
 
 function getnameinfo(addr: PSockAddr; namelen: tsocklen; host: PAnsiChar;
    hostlen: tsocklen; serv: PAnsiChar; servlen: tsocklen; flags: integer): integer; cdecl;
-  external clib name 'getnameinfo';
+  external clib name 'getnameinfo' + LIBC_SUFFIX;
 
 function bind(s: integer; addr: PSockAddr; namelen: tsocklen): integer; cdecl;
-  external clib name 'bind';
+  external clib name 'bind' + LIBC_SUFFIX;
 
 function getsockname(s: integer; name: PSockAddr; var namelen: tsocklen): integer; cdecl;
-  external clib name 'getsockname';
+  external clib name 'getsockname' + LIBC_SUFFIX;
 
 function listen(s: integer; backlog: integer): integer; cdecl;
-  external clib name 'listen';
+  external clib name 'listen' + LIBC_SUFFIX;
 
 function accept(s: integer; addr: PSockAddr; var addrlen: tsocklen): integer; cdecl;
-  external clib name 'accept';
+  external clib name 'accept' + LIBC_SUFFIX;
+
+{$undef ACCEPT4_SYSCALL}
 
 {$ifdef HASACCEPT4}
-function accept4(s: integer; addr: PSockAddr; var addrlen: tsocklen; flags: integer): integer; cdecl;
-  external clib name 'accept4';
+
+function accept4(s: integer; addr: PSockAddr; var addrlen: tsocklen; flags: integer): integer;
+  cdecl; external clib name 'accept4'  // no LIBC_SUFFIX: libc 2.10 is required
+    {$ifdef OSLINUXINTEL} + '@GLIBC_2.10' {$endif} ;
+
 {$endif HASACCEPT4}
 
 function connect(s: integer; name: PSockAddr; namelen: tsocklen): integer; cdecl;
-  external clib name 'connect';
+  external clib name 'connect' + LIBC_SUFFIX;
 
 function select(nfds: integer; readfds, writefds, exceptfds: PFDSet;
    timeout: PTimeVal): integer; cdecl;
-  external clib name 'select';
+  external clib name 'select' + LIBC_SUFFIX;
 
 function recv(s: integer; Buf: Pointer; len: size_t; flags: integer): ssize_t; cdecl;
-  external clib name 'recv';
+  external clib name 'recv' + LIBC_SUFFIX;
 
 function recvfrom(s: integer; Buf: Pointer; len: size_t; flags: integer;
    from: PSockAddr; fromlen: Pinteger): ssize_t; cdecl;
-  external clib name 'recvfrom';
+  external clib name 'recvfrom' + LIBC_SUFFIX;
 
 function send(s: integer; Buf: Pointer; len: size_t; flags: integer): ssize_t; cdecl;
-  external clib name 'send';
+  external clib name 'send' + LIBC_SUFFIX;
 
 function sendto(s: integer; Buf: Pointer; len: size_t; flags: integer;
    addrto: PSockAddr; tolen: integer): ssize_t; cdecl;
-  external clib name 'sendto';
+  external clib name 'sendto' + LIBC_SUFFIX;
 
 function getpeername(s: integer; name: PSockAddr; var namelen: tsocklen): integer; cdecl;
-  external clib name 'getpeername';
+  external clib name 'getpeername' + LIBC_SUFFIX;
 
 {$endif SOCKDIRECTSYSCALL}
 
@@ -359,7 +367,7 @@ begin
 end;
 {$else}
 function poll(fds: PPollFD; nfds, timeout: integer): integer; cdecl;
-  external clib name 'poll';
+  external clib name 'poll' + LIBC_SUFFIX;
 {$endif OSDARWIN}
 
 function sockerrno: integer; inline;