diff -uNr fossil-2.11/auto.def fossil-2.11.mod/auto.def
--- fossil-2.11/auto.def	2020-05-26 02:23:49.000000000 +0300
+++ fossil-2.11.mod/auto.def	2020-05-26 16:29:51.235602973 +0300
@@ -133,51 +133,17 @@
       # not stmt_isexplain(), then the system SQLite is too old to link against
       # fossil.
       #
-      if {[check-function-in-lib sqlite3_open sqlite3 $extralibs]} {
-        # Success. Update symbols and return.
-        #
-        define USE_SYSTEM_SQLITE 1
-        define-append LIBS -lsqlite3
-        define-append LIBS $extralibs
-        return
-      }
+      # Update symbols and return.
+      #
+      define USE_SYSTEM_SQLITE 1
+      define-append LIBS -lsqlite3
+      define-append LIBS $extralibs
+      return
     }
     user-error "system sqlite3 not found"
   }
 
   find_system_sqlite
-
-  proc test_system_sqlite {} {
-    # Check compatibility of the system SQLite library by running the sqlcompttest.c
-    # program in the source tree
-    #
-    set cmdline {}
-    lappend cmdline {*}[get-define CCACHE]
-    lappend cmdline {*}[get-define CC] {*}[get-define CFLAGS]
-    lappend cmdline $::autosetup(dir)/../src/sqlcompattest.c -o conftest__
-    lappend cmdline {*}[get-define LDFLAGS]
-    lappend cmdline {*}[get-define LIBS]
-    set ok 1
-    set err [catch {exec-with-stderr {*}$cmdline} result errinfo]
-    if {$err} {
-       configlog "Failed: [join $cmdline]"
-       if {[string length $result]>0} {configlog $result}
-       configlog "============"
-       set ok 0
-    } elseif {$::autosetup(debug)} {
-       configlog "Compiled OK: [join $cmdline]"
-       configlog "============"
-    }
-    if {!$ok} {
-      user-error "unable to compile SQLite compatibility test program"
-    }
-    set err [catch {exec-with-stderr ./conftest__} result errinfo]
-    if {$err} {
-      user-error $result
-    }
-    file delete ./conftest__
-  }
-  test_system_sqlite
     
 }
 
@@ -275,7 +241,7 @@
 cc-check-function-in-lib iconv iconv
 
 # Helper for OpenSSL checking
-proc check-for-openssl {msg {cflags {}} {libs {-lssl -lcrypto -lpthread}}} {
+proc check-for-openssl {msg {cflags {}} {libs {-lssl -lcrypto}}} {
     msg-checking "Checking for $msg..."
     set rc 0
     if {[is_mingw]} {
@@ -353,7 +319,7 @@
         set msg "ssl in $ssldir"
         set cflags "-I$ssldir/include"
         set ldflags "-L$ssldir"
-        set ssllibs "$ssldir/libssl.a $ssldir/libcrypto.a -lpthread"
+        set ssllibs "$ssldir/libssl.a $ssldir/libcrypto.a"
         set found [check-for-openssl "ssl in source tree" "$cflags $ldflags" $ssllibs]
     } else {
         if {$ssldirs in {auto ""}} {
@@ -479,23 +445,6 @@
             cc-with [list -cflags $cflags -libs $libs] {
                 if {$tclstubs} {
                     if {[cc-check-functions Tcl_InitStubs]} {
-                        set foundtcl 1
-                    }
-                } else {
-                    if {[cc-check-functions Tcl_CreateInterp]} {
-                        set foundtcl 1
-                    }
-                }
-            }
-        }
-        if {!$foundtcl && ![string match *-lpthread* $libs]} {
-            # On some systems, TCL_LIB_SPEC appears to be missing
-            # "-lpthread".  Try adding it.
-            msg-result "Adding \"-lpthread\" and retrying for Tcl..."
-            set libs "$libs -lpthread"
-            cc-with [list -cflags $cflags -libs $libs] {
-                if {$tclstubs} {
-                    if {[cc-check-functions Tcl_InitStubs]} {
                         set foundtcl 1
                     }
                 } else {