diff --git a/pkgs/development/interpreters/tcl/8.6.nix b/pkgs/development/interpreters/tcl/8.6.nix
index 2c3a57df6b818..09b3925c12ccb 100644
--- a/pkgs/development/interpreters/tcl/8.6.nix
+++ b/pkgs/development/interpreters/tcl/8.6.nix
@@ -1,4 +1,10 @@
-{ callPackage, fetchurl, ... }@args:
+{
+  lib,
+  stdenv,
+  callPackage,
+  fetchurl,
+  ...
+}@args:
 
 callPackage ./generic.nix (
   args
@@ -12,5 +18,7 @@ callPackage ./generic.nix (
       url = "mirror://sourceforge/tcl/tcl${version}-src.tar.gz";
       hash = "sha256-kcuPphdxxjwmLvtVMFm3x61nV6+lhXr2Jl5LC9wqFKU=";
     };
+
+    patches = lib.optional stdenv.hostPlatform.isCygwin ./fix-cygwin-build.patch;
   }
 )
diff --git a/pkgs/development/interpreters/tcl/fix-cygwin-build.patch b/pkgs/development/interpreters/tcl/fix-cygwin-build.patch
new file mode 100644
index 0000000000000..8c7bf5ffdc226
--- /dev/null
+++ b/pkgs/development/interpreters/tcl/fix-cygwin-build.patch
@@ -0,0 +1,79 @@
+diff --git a/generic/tcl.h b/generic/tcl.h
+index fc772d5b3c..3227398c57 100644
+--- a/generic/tcl.h
++++ b/generic/tcl.h
+@@ -462,22 +462,6 @@ typedef unsigned TCL_WIDE_INT_TYPE	Tcl_WideUInt;
+ #   else
+ 	typedef struct _stat32i64 Tcl_StatBuf;
+ #   endif /* _MSC_VER < 1400 */
+-#elif defined(__CYGWIN__)
+-    typedef struct {
+-	unsigned st_dev;
+-	unsigned short st_ino;
+-	unsigned short st_mode;
+-	short st_nlink;
+-	short st_uid;
+-	short st_gid;
+-	/* Here is a 2-byte gap */
+-	unsigned st_rdev;
+-	/* Here is a 4-byte gap */
+-	long long st_size;
+-	struct {long tv_sec;} st_atim;
+-	struct {long tv_sec;} st_mtim;
+-	struct {long tv_sec;} st_ctim;
+-    } Tcl_StatBuf;
+ #elif defined(HAVE_STRUCT_STAT64) && !defined(__APPLE__)
+     typedef struct stat64 Tcl_StatBuf;
+ #else
+diff --git a/unix/Makefile.in b/unix/Makefile.in
+index bc743b3892..be0a207c93 100644
+--- a/unix/Makefile.in
++++ b/unix/Makefile.in
+@@ -637,9 +637,6 @@ ${LIB_FILE}: ${STUB_LIB_FILE} ${OBJS}
+ 	@MAKE_LIB@
+ 
+ ${STUB_LIB_FILE}: ${STUB_LIB_OBJS}
+-	@if test "x${LIB_FILE}" = "xlibtcl${MAJOR_VERSION}.${MINOR_VERSION}.dll"; then \
+-	    (cd ${TOP_DIR}/win; ${MAKE} winextensions); \
+-	fi
+ 	rm -f $@
+ 	@MAKE_STUB_LIB@
+ 
+diff --git a/unix/tcl.m4 b/unix/tcl.m4
+index 7f5464e651..88bcd93c52 100644
+--- a/unix/tcl.m4
++++ b/unix/tcl.m4
+@@ -1185,7 +1185,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
+ 	    ;;
+ 	CYGWIN_*|MINGW32_*|MSYS_*)
+ 	    SHLIB_CFLAGS="-fno-common"
+-	    SHLIB_LD='${CC} -shared'
++	    SHLIB_LD='${CC} -shared -Wl,--out-implib,$(patsubst %.dll,%.dll.a,[$]@)'
+ 	    SHLIB_SUFFIX=".dll"
+ 	    DL_OBJS="tclLoadDl.o"
+ 	    PLAT_OBJS='${CYGWIN_OBJS}'
+@@ -1210,15 +1210,6 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
+ 		AC_MSG_ERROR([CYGWIN compile is only supported with --enable-threads])
+ 	    fi
+ 	    do64bit_ok=yes
+-	    if test "x${SHARED_BUILD}" = "x1"; then
+-		echo "running cd ../win; ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args --enable-64bit --host=x86_64-w64-mingw32"
+-		# The eval makes quoting arguments work.
+-		if cd ../win; eval ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args --enable-64bit --host=x86_64-w64-mingw32; cd ../unix
+-		then :
+-		else
+-		    { echo "configure: error: configure failed for ../win" 1>&2; exit 1; }
+-		fi
+-	    fi
+ 	    ;;
+ 	dgux*)
+ 	    SHLIB_CFLAGS="-K PIC"
+@@ -2002,7 +1993,7 @@ dnl # preprocessing tests use only CPPFLAGS.
+ 	LIB_SUFFIX=${SHARED_LIB_SUFFIX}
+ 	MAKE_LIB='${SHLIB_LD} -o [$]@ ${OBJS} ${LDFLAGS} ${SHLIB_LD_LIBS} ${TCL_SHLIB_LD_EXTRAS} ${TK_SHLIB_LD_EXTRAS} ${LD_SEARCH_FLAGS}'
+ 	AS_IF([test "${SHLIB_SUFFIX}" = ".dll"], [
+-	    INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(BIN_INSTALL_DIR)/$(LIB_FILE)"'
++	    INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(BIN_INSTALL_DIR)/$(LIB_FILE)" && $(INSTALL_LIBRARY) $(LIB_FILE).a "$(LIB_INSTALL_DIR)/$(LIB_FILE).a"'
+ 	    DLL_INSTALL_DIR="\$(BIN_INSTALL_DIR)"
+ 	], [
+ 	    INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(LIB_INSTALL_DIR)/$(LIB_FILE)"'
diff --git a/pkgs/development/interpreters/tcl/generic.nix b/pkgs/development/interpreters/tcl/generic.nix
index 9f2e781124e54..b50e25d390fdf 100644
--- a/pkgs/development/interpreters/tcl/generic.nix
+++ b/pkgs/development/interpreters/tcl/generic.nix
@@ -1,7 +1,9 @@
 {
   lib,
   stdenv,
+  autoreconfHook,
   callPackage,
+  deterministic-host-uname,
   makeSetupHook,
   runCommand,
   tzdata,
@@ -12,6 +14,7 @@
   release,
   version,
   src,
+  patches ? [ ],
   extraPatch ? "",
   ...
 }:
@@ -28,6 +31,8 @@ let
 
     setOutputFlags = false;
 
+    inherit patches;
+
     postPatch = ''
       substituteInPlace library/clock.tcl \
         --replace "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo" \
@@ -37,15 +42,22 @@ let
     ''
     + extraPatch;
 
-    nativeBuildInputs = lib.optionals (lib.versionAtLeast version "9.0") [
-      # Only used to detect the presence of zlib. Could be replaced with a stub.
-      zip
-    ];
+    nativeBuildInputs =
+      lib.optionals (lib.versionAtLeast version "9.0") [
+        # Only used to detect the presence of zlib. Could be replaced with a stub.
+        zip
+      ]
+      ++ lib.optional (
+        !lib.systems.equals stdenv.hostPlatform stdenv.buildPlatform
+      ) deterministic-host-uname
+      ++ lib.optional stdenv.hostPlatform.isCygwin autoreconfHook;
 
     buildInputs = lib.optionals (lib.versionAtLeast version "9.0") [
       zlib
     ];
 
+    autoreconfFlags = if stdenv.hostPlatform.isCygwin then "unix" else null;
+
     preConfigure = ''
       cd unix
     '';
@@ -108,18 +120,25 @@ let
       let
         dllExtension = stdenv.hostPlatform.extensions.sharedLibrary;
         staticExtension = stdenv.hostPlatform.extensions.staticLibrary;
+        exeExtension = stdenv.hostPlatform.extensions.executable;
+        dllDir = if stdenv.hostPlatform.isCygwin then "bin" else "lib";
       in
       ''
         make install-private-headers
-        ln -s $out/bin/tclsh${release} $out/bin/tclsh
+        ln -s $out/bin/tclsh${release}${exeExtension} $out/bin/tclsh${exeExtension}
         if [[ -e $out/lib/libtcl${release}${staticExtension} ]]; then
           ln -s $out/lib/libtcl${release}${staticExtension} $out/lib/libtcl${staticExtension}
         fi
         ${lib.optionalString (!stdenv.hostPlatform.isStatic) ''
-          ln -s $out/lib/libtcl${release}${dllExtension} $out/lib/libtcl${dllExtension}
+          ln -s $out/${dllDir}/libtcl${release}${dllExtension} $out/${dllDir}/libtcl${dllExtension}
         ''}
+      ''
+      + lib.optionalString stdenv.hostPlatform.isCygwin ''
+        ln -s $out/lib/libtcl${release}.dll${staticExtension} $out/lib/libtcl.dll${staticExtension}
       '';
 
+    allowedImpureDLLs = [ "USER32.dll" ];
+
     meta = {
       description = "Tcl scripting language";
       homepage = "https://www.tcl.tk/";
diff --git a/pkgs/development/libraries/sqlite/default.nix b/pkgs/development/libraries/sqlite/default.nix
index 9c6d4d86828d8..7e01170afeb04 100644
--- a/pkgs/development/libraries/sqlite/default.nix
+++ b/pkgs/development/libraries/sqlite/default.nix
@@ -66,6 +66,8 @@ stdenv.mkDerivation rec {
     ncurses
   ];
 
+  patches = lib.optional (stdenv.hostPlatform.extensions.executable != "") ./fix-target-exeext.patch;
+
   # required for aarch64 but applied for all arches for simplicity
   preConfigure = ''
     patchShebangs configure
diff --git a/pkgs/development/libraries/sqlite/fix-target-exeext.patch b/pkgs/development/libraries/sqlite/fix-target-exeext.patch
new file mode 100644
index 0000000000000..a922afa6e850c
--- /dev/null
+++ b/pkgs/development/libraries/sqlite/fix-target-exeext.patch
@@ -0,0 +1,15 @@
+diff --git a/autosetup/sqlite-config.tcl b/autosetup/sqlite-config.tcl
+index 384275f..c30b052 100644
+--- a/autosetup/sqlite-config.tcl
++++ b/autosetup/sqlite-config.tcl
+@@ -1994,8 +1994,8 @@ proc sqlite-check-tcl {} {
+     proj-assert {"" ne $tclExecPrefix}
+     msg-result "AFTER4"
+     set tryThese [list \
+-                    $tclExecPrefix/bin/tclsh[get-define TCL_VERSION] \
+-                    $tclExecPrefix/bin/tclsh ]
++                    $tclExecPrefix/bin/tclsh[get-define TCL_VERSION][get-define TARGET_EXEEXT] \
++                    $tclExecPrefix/bin/tclsh[get-define TARGET_EXEEXT] ]
+     foreach trySh $tryThese {
+       if {[file-isexec $trySh]} {
+         set with_tclsh $trySh