there's some missing dependency ordering issue in the make/autoconf when building on aarch64 (not sure why it's not being seen on other arches)

Failed build:
http://arm.koji.fedoraproject.org/koji/taskinfo?taskID=2896751

gcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"mod_nss\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -I. -I/usr/include/httpd -I/usr/include/nspr4 -I/usr/include/nss3  -I/usr/include/apr-1     -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches  -c -o nss_pcache.o nss_pcache.c
gcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"mod_nss\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -I. -I/usr/include/httpd -I/usr/include/nspr4 -I/usr/include/nss3  -I/usr/include/apr-1     -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches  -DNSS_ENABLE_ECC -DLINUX -D_REENTRANT -D_GNU_SOURCE -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches  -c -o test_cipher-test_cipher.o `test -f 'test_cipher.c' || echo './'`test_cipher.c
make: *** No rule to make target '.libs/nss_engine_cipher.o', needed by 'test_cipher'.  Stop.
make: *** Waiting for unfinished jobs....
libtool: compile:  gcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"mod_nss\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -I. -I/usr/include/httpd -I/usr/include/nspr4 -I/usr/include/nss3 -I/usr/include/apr-1 -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -DNSS_ENABLE_ECC -DLINUX -D_REENTRANT -D_GNU_SOURCE -c nss_engine_cipher.c  -fPIC -DPIC -o .libs/nss_engine_cipher.o
libtool: compile:  gcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"mod_nss\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -I. -I/usr/include/httpd -I/usr/include/nspr4 -I/usr/include/nss3 -I/usr/include/apr-1 -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -DNSS_ENABLE_ECC -DLINUX -D_REENTRANT -D_GNU_SOURCE -c nss_util.c -o nss_util.o >/dev/null 2>&1
libtool: compile:  gcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"mod_nss\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -I. -I/usr/include/httpd -I/usr/include/nspr4 -I/usr/include/nss3 -I/usr/include/apr-1 -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -DNSS_ENABLE_ECC -DLINUX -D_REENTRANT -D_GNU_SOURCE -c nss_engine_rand.c -o nss_engine_rand.o >/dev/null 2>&1
In file included from /usr/include/string.h:639:0,
                 from test_cipher.c:15:
In function 'strncat',
    inlined from 'main' at test_cipher.c:88:17:
/usr/include/bits/string3.h:156:3: warning: call to __builtin___strncat_chk might overflow destination buffer
   return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
   ^
libtool: compile:  gcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"mod_nss\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -I. -I/usr/include/httpd -I/usr/include/nspr4 -I/usr/include/nss3 -I/usr/include/apr-1 -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -DNSS_ENABLE_ECC -DLINUX -D_REENTRANT -D_GNU_SOURCE -c nss_expr_scan.c -o nss_expr_scan.o >/dev/null 2>&1
libtool: compile:  gcc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"mod_nss\" -DVERSION=\"1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -I. -I/usr/include/httpd -I/usr/include/nspr4 -I/usr/include/nss3 -I/usr/include/apr-1 -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -DNSS_ENABLE_ECC -DLINUX -D_REENTRANT -D_GNU_SOURCE -c nss_engine_cipher.c -o nss_engine_cipher.o >/dev/null 2>&1
RPM build errors:

When the SMP is disabled like:

-make %{?_smp_mflags} all
+make all

It builds fine (scratch build):
http://arm.koji.fedoraproject.org/koji/taskinfo?taskID=2896777