How to fix implicit declaration and consequential problems when trying to install a C program on Linux (randfold-2.0)?

Question

I am trying to compile randfold-2.0 on an HPC cluster I am working from, but am encountering troubles. When I try the compilation using make I got the following error message:

*user@loginnode*:~/mirdeep2/essentials/randfold-2.0> make
gcc -O3 -I. -I/***/mirdeep2/essentials/squid-1.9g -L/***/mirdeep2/essentials/squid-1.9g/ -o randfold params.o energy_par.o fold.o fold_vars.o utils.o randfold.c -lm -lsquid
randfold.c: In function ‘main’:
randfold.c:89:2: warning: implicit declaration of function ‘strcpy’ [-Wimplicit-function-declaration]
  strcpy(seqfile,*argv);
  ^~~~~~
randfold.c:89:2: warning: incompatible implicit declaration of built-in function ‘strcpy’
randfold.c:89:2: note: include ‘<string.h>’ or provide a declaration of ‘strcpy’

The implicit declaration problems occurs multiple times, also referring to strlen for example. I found a fix here http://seqanswers.com/forums/showthread.php?t=47751 that said to include #include <string.h> into the randfrold.c-file.

After that I got numerous other error messages which all read like this, referencing different "_intel***" files:

/usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: /dss/dsshome1/lxc09/ra57qey/mirdeep2/essentials/squid-1.9g//libsquid.a(shuffle.o): in function `StrShuffle':
shuffle.c:(.text+0x29): undefined reference to `__intel_sse2_strcpy'

I am no C developer and have no experience with it. Has anybody encountered similar issues or has an idea how to fix this issue? Help would be greatly appreciated!