the last lines in the make file are missing the needed library ssl
gcc -static -shared DH1080_tcl.o DH1080.o base64.o -o DH1080_tcl.so
should be
gcc -static -shared DH1080_tcl.o DH1080.o base64.o -lssl -lcrypto -o DH1080_tcl.so
DH1080.c includes a openssl header file named sha.h which makes openssl library required for this plugin to work
the last lines in the make file are missing the needed library ssl
gcc -static -shared DH1080_tcl.o DH1080.o base64.o -o DH1080_tcl.so
should begcc -static -shared DH1080_tcl.o DH1080.o base64.o -lssl -lcrypto -o DH1080_tcl.so
DH1080.c includes a openssl header file named sha.h which makes openssl library required for this plugin to work