Seems to no longer make correctly

[Simplyfenton]

Could certainly be an error on my end, however upon trying to make the project I'm met with several "Undefined reference to" errors originating from various files, all/most of which are detailed in the error given below.

/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(legodimensions.c.o): in function ld_scramble': /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:23: undefined reference to g_assertion_message_expr'
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:23:(.text+0x72): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_assertion_message_expr' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:29: undefined reference to g_log'
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:29:(.text+0xce): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_log' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:41: undefined reference to g_log'
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:41:(.text+0x1a3): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_log' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(legodimensions.c.o): in function ld_genteakey':
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:50: undefined reference to g_assertion_message_expr' /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:50:(.text+0x231): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_assertion_message_expr'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:57: undefined reference to g_log' /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:57:(.text+0x2fb): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_log'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:58: undefined reference to g_free' /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:58:(.text+0x307): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_free'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(legodimensions.c.o): in function ld_genpwd': /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:68: undefined reference to g_assertion_message_expr'
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:68:(.text+0x38b): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_assertion_message_expr' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:74: undefined reference to g_log'
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:74:(.text+0x3f0): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_log' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:85: undefined reference to g_log'
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:85:(.text+0x4be): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_log' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:89: undefined reference to g_log'
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:89:(.text+0x51d): relocation truncated to fit: R_X86_64_PC32 against undefined symbol g_log' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(legodimensions.c.o): in function ld_decrypt_character_pages':
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:105: undefined reference to g_assertion_message_expr' /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:105:(.text+0x574): additional relocation overflows omitted from the output /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:109: undefined reference to g_log'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:128: undefined reference to g_log' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:133: undefined reference to g_log'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:135: undefined reference to g_assertion_message_cmpnum' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:139: undefined reference to g_log'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:142: undefined reference to g_free' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(legodimensions.c.o): in function ld_decode_vehicle_id':
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:150: undefined reference to g_assertion_message' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(legodimensions.c.o): in function ld_encrypt':
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:164: undefined reference to g_assertion_message_expr' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:169: undefined reference to g_log'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:184: undefined reference to g_log' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/legodimensions.c:186: undefined reference to g_free'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(utils.c.o): in function g_to_hex': /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:7: undefined reference to g_malloc'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:10: undefined reference to g_snprintf' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(utils.c.o): in function strdup_hex':
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:18: undefined reference to g_strdup' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:21: undefined reference to g_strdup_printf'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:22: undefined reference to g_free' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(utils.c.o): in function debug_hex':
/cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:33: undefined reference to g_log' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:34: undefined reference to g_free'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(utils.c.o): in function debug_hex32': /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:40: undefined reference to g_log'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: liblegodimensions.a(utils.c.o): in function xdigit_str_to_guint8': /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:48: undefined reference to g_assertion_message_expr'
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:52: undefined reference to g_ascii_xdigit_value' /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /cygdrive/d/My Files/Documents/Lego Dimensions Stuff/ldnfctags/src/utils.c:60: undefined reference to g_ascii_xdigit_value'
collect2: error: ld returned 1 exit status
make[2]: *** [src/CMakeFiles/ldpwgen.dir/build.make:105: src/ldpwgen.exe] Error 1
make[1]: *** [CMakeFiles/Makefile2:505: src/CMakeFiles/ldpwgen.dir/all] Error 2
make: *** [Makefile:104: all] Error 2

[faxm0dem]

I just followed the instructions and successfully built the project on a Debian Bullseye.
From your logs I infer you're trying to build on cygwin. Did you try using WSL instead ?