diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index 7b0a917..f81701a 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -29,7 +29,7 @@
 func s:get_resources()
   let pid = getpid()
 
-  if has('mac')
+  if executable('lsof')
     return systemlist('lsof -p ' . pid . ' | awk ''$4~/^[0-9]*[rwu]$/&&$5=="REG"{print$NF}''')
   elseif isdirectory('/proc/' . pid . '/fd/')
     return systemlist('readlink /proc/' . pid . '/fd/* | grep -v ''^/dev/''')
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index ceb8486..b08d9aa 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -1054,22 +1054,31 @@
     let libc = 'msvcrt.dll'
   elseif has('mac')
     let libc = 'libSystem.B.dylib'
-  elseif system('uname -s') =~ 'SunOS'
-    " Set the path to libc.so according to the architecture.
-    let test_bits = system('file ' . GetVimProg())
-    let test_arch = system('uname -p')
-    if test_bits =~ '64-bit' && test_arch =~ 'sparc'
-      let libc = '/usr/lib/sparcv9/libc.so'
-    elseif test_bits =~ '64-bit' && test_arch =~ 'i386'
-      let libc = '/usr/lib/amd64/libc.so'
-    else
-      let libc = '/usr/lib/libc.so'
-    endif
-  else
+  elseif executable('ldd')
+    let libc = matchstr(split(system('ldd ' . GetVimProg())), '/libc\.so\>')
+  endif
+  if get(l:, 'libc', '') ==# ''
     " On Unix, libc.so can be in various places.
-    " Interestingly, using an empty string for the 1st argument of libcall
-    " allows to call functions from libc which is not documented.
-    let libc = ''
+    if has('linux')
+      " There is not documented but regarding the 1st argument of glibc's
+      " dlopen an empty string and nullptr are equivalent, so using an empty
+      " string for the 1st argument of libcall allows to call functions.
+      let libc = ''
+    elseif has('sun')
+      " Set the path to libc.so according to the architecture.
+      let test_bits = system('file ' . GetVimProg())
+      let test_arch = system('uname -p')
+      if test_bits =~ '64-bit' && test_arch =~ 'sparc'
+        let libc = '/usr/lib/sparcv9/libc.so'
+      elseif test_bits =~ '64-bit' && test_arch =~ 'i386'
+        let libc = '/usr/lib/amd64/libc.so'
+      else
+        let libc = '/usr/lib/libc.so'
+      endif
+    else
+      " Unfortunately skip this test until a good way is found.
+      return
+    endif
   endif
 
   if has('win32')
@@ -1208,3 +1217,32 @@
   call assert_fails('call confirm("Are you sure?", "&Yes\n&No\n", [])', 'E745:')
   call assert_fails('call confirm("Are you sure?", "&Yes\n&No\n", 0, [])', 'E730:')
 endfunc
+
+func Test_platform_name()
+  " The system matches at most only one name.
+  let names = ['amiga', 'beos', 'bsd', 'hpux', 'linux', 'mac', 'qnx', 'sun', 'vms', 'win32', 'win32unix']
+  call assert_inrange(0, 1, len(filter(copy(names), 'has(v:val)')))
+
+  " Is Unix?
+  call assert_equal(has('beos'), has('beos') && has('unix'))
+  call assert_equal(has('bsd'), has('bsd') && has('unix'))
+  call assert_equal(has('hpux'), has('hpux') && has('unix'))
+  call assert_equal(has('linux'), has('linux') && has('unix'))
+  call assert_equal(has('mac'), has('mac') && has('unix'))
+  call assert_equal(has('qnx'), has('qnx') && has('unix'))
+  call assert_equal(has('sun'), has('sun') && has('unix'))
+  call assert_equal(has('win32'), has('win32') && !has('unix'))
+  call assert_equal(has('win32unix'), has('win32unix') && has('unix'))
+
+  if has('unix') && executable('uname')
+    let uname = system('uname')
+    call assert_equal(uname =~? 'BeOS', has('beos'))
+    call assert_equal(uname =~? 'BSD\|DragonFly', has('bsd'))
+    call assert_equal(uname =~? 'HP-UX', has('hpux'))
+    call assert_equal(uname =~? 'Linux', has('linux'))
+    call assert_equal(uname =~? 'Darwin', has('mac'))
+    call assert_equal(uname =~? 'QNX', has('qnx'))
+    call assert_equal(uname =~? 'SunOS', has('sun'))
+    call assert_equal(uname =~? 'CYGWIN\|MSYS', has('win32unix'))
+  endif
+endfunc
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index 25ec2b5..698da04 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -559,7 +559,7 @@
 
 func Test_terminal_noblock()
   let buf = term_start(&shell)
-  if has('mac')
+  if has('bsd') || has('mac') || has('sun')
     " The shell or something else has a problem dealing with more than 1000
     " characters at the same time.
     let len = 1000
diff --git a/src/testdir/test_writefile.vim b/src/testdir/test_writefile.vim
index 2e47b48..ff36756 100644
--- a/src/testdir/test_writefile.vim
+++ b/src/testdir/test_writefile.vim
@@ -33,7 +33,7 @@
 endfunc
 
 func Test_writefile_fails_conversion()
-  if !has('iconv') || system('uname -s') =~ 'SunOS'
+  if !has('iconv') || has('sun')
     return
   endif
   set nobackup nowritebackup