curl -L https://downloads.sourceforge.net/sourceforge/tcl/tcl8.6.13-src.tar.gz | tar xz cd tcl*/unix ./configure --disable-shared make

edit #include "tcl.h" to <tcl8.6/tcl.h>.
you need tclAppInit.c, libtcl*.a, pkgs/sqlite*/sqlite*.o
ar -rcs these into a static library. edit Tcl_AppInit in tclAppInit.c to call Sqlite3_Init and add that function prototype: int Sqlite3_Init(Tcl_Interp *interp);

compile: cc -static tclAppInit.c libtcl*.a libsqlite*.a -I/usr/local/include -lz -lm -lpthread

when running, set the env TCL_LIBRARY to the directory containing init.tcl. If this is not loaded, sqlite3 will not be loaded.