Cannot build statically-linked binary

I'm trying to build a statically-linked binary as I have that I cannot use git-crypt on Oracle Linux 9.1 (and I have become pretty dependent on it).

I add the CXXFLAGS from the Makefile and add `-static` and `-pthread`, but I get these errors:

$ CXXFLAGS='-Wall -pedantic -Wno-long-long -O2 -static -pthread' make
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o git-crypt.o git-crypt.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o commands.o commands.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o crypto.o crypto.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o gpg.o gpg.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o key.o key.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o util.o util.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o parse_options.o parse_options.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o coprocess.o coprocess.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o fhstream.o fhstream.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o crypto-openssl-10.o crypto-openssl-10.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -c -o crypto-openssl-11.o crypto-openssl-11.cpp
g++ -Wall -pedantic -Wno-long-long -O2 -static -pthread -std=c++11 -o git-crypt git-crypt.o commands.o crypto.o gpg.o key.o util.o parse_options.o coprocess.o fhstream.o crypto-openssl-10.o crypto-openssl-11.o -lcrypto
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libcrypto.a(b_addr.o): in function `BIO_lookup_ex':
(.text+0xcef): warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libcrypto.a(b_sock.o): in function `BIO_gethostbyname':
(.text+0x71): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_globallookup':
(.text+0x13): undefined reference to `dlopen'
/usr/bin/ld: (.text+0x26): undefined reference to `dlsym'
/usr/bin/ld: (.text+0x31): undefined reference to `dlclose'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_pathbyaddr':
(.text+0x72): undefined reference to `dladdr'
/usr/bin/ld: (.text+0xe7): undefined reference to `dlerror'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_bind_func':
(.text+0x3f7): undefined reference to `dlsym'
/usr/bin/ld: (.text+0x4c2): undefined reference to `dlerror'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_load':
(.text+0x531): undefined reference to `dlopen'
/usr/bin/ld: (.text+0x5a9): undefined reference to `dlclose'
/usr/bin/ld: (.text+0x5e5): undefined reference to `dlerror'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_unload':
(.text+0x6a4): undefined reference to `dlclose'
collect2: error: ld returned 1 exit status
make: *** [Makefile:50: git-crypt] Error 1

What can I do? I'm using Debian/Ubuntu.