diff --git a/Namcap/rules/elffiles.py b/Namcap/rules/elffiles.py
index 98cdbc0..ae55d08 100644
--- a/Namcap/rules/elffiles.py
+++ b/Namcap/rules/elffiles.py
@@ -10,7 +10,7 @@ from Namcap.util import is_elf
 from Namcap.ruleclass import TarballRule
 
 # Valid directories for ELF files
-valid_dirs = ["bin/", "sbin/", "usr/bin/", "usr/sbin/", "lib/", "usr/lib/", "usr/lib32/"]
+valid_dirs = ["bin/", "sbin/", "usr/bin/", "usr/sbin/", "lib/", "lib64", "usr/lib/", "usr/lib32/", "usr/lib64/"]
 # Questionable directories for ELF files
 # (Suppresses some output spam.)
 questionable_dirs = ["opt/"]
diff --git a/Namcap/rules/fhs.py b/Namcap/rules/fhs.py
index 8e081fe..a92e8a5 100644
--- a/Namcap/rules/fhs.py
+++ b/Namcap/rules/fhs.py
@@ -19,6 +19,7 @@ class FHSRule(TarballRule):
             "usr/include/",
             "usr/lib/",
             "usr/lib32/",
+            "usr/lib64/",
             "usr/sbin/",
             "usr/share/",
             "usr/src/",
@@ -111,6 +112,6 @@ class RubyPathsRule(TarballRule):
 
     def analyze(self, pkginfo, tar):
         for i in tar.getmembers():
-            if i.name.startswith("usr/lib/ruby/site_ruby"):
+            if i.name.startswith("usr/lib64/ruby/site_ruby"):
                 self.warnings.append(("site-ruby", ()))
                 return
diff --git a/Namcap/rules/pcdepends.py b/Namcap/rules/pcdepends.py
index 1e43857..0e324e5 100644
--- a/Namcap/rules/pcdepends.py
+++ b/Namcap/rules/pcdepends.py
@@ -19,12 +19,12 @@ def scanpcfiles(tar, pclist):
 
     pkg_pc_files = [f for f in tar.getnames() if ".pc" in f]
     for f in pkg_pc_files:
-        if f.startswith("usr/lib/pkgconfig") or f.startswith("usr/share/pkgconfig"):
-            pcname = f.replace("usr/lib/pkgconfig/", "").replace("usr/share/pkgconfig/", "").replace(".pc", "")
+        if f.startswith("usr/lib64/pkgconfig") or f.startswith("usr/share/pkgconfig"):
+            pcname = f.replace("usr/lib64/pkgconfig/", "").replace("usr/share/pkgconfig/", "").replace(".pc", "")
             pkgconfig_command = "pkg-config"
         elif f.startswith("usr/lib32/pkgconfig"):
             pcname = f.replace("usr/lib32/pkgconfig/", "").replace(".pc", "")
-            pkgconfig_command = "i686-pc-linux-gnu-pkg-config"
+            pkgconfig_command = "i686-flarebird-linux-gnu-pkg-config"
         else:
             continue
 
diff --git a/Namcap/rules/pydepends.py b/Namcap/rules/pydepends.py
index d2bcd66..cd22474 100644
--- a/Namcap/rules/pydepends.py
+++ b/Namcap/rules/pydepends.py
@@ -35,7 +35,7 @@ def finddepends(pkgname, modules, gir_modules, gir_versions):
     for module in modules:
         # Check application-specific python modules
         if importlib.machinery.PathFinder.find_spec(
-            module.split(".")[0], ["/usr/lib/" + pkgname, "/usr/share/" + pkgname]
+            module.split(".")[0], ["/usr/lib64/" + pkgname, "/usr/share/" + pkgname]
         ):
             dependlist[pkgname].add(module)
             continue
@@ -67,10 +67,10 @@ def finddepends(pkgname, modules, gir_modules, gir_versions):
                         dependlist[pkg.name].add(k)
                         foundlibs.add(k)
 
-            if j.startswith("usr/lib/girepository-1.0/"):
+            if j.startswith("usr/lib64/girepository-1.0/"):
                 for module in gir_modules:
                     gir_module = module.replace("gi.repository.", "")
-                    if j.startswith("usr/lib/girepository-1.0/" + gir_module + "-" + gir_versions[gir_module]):
+                    if j.startswith("usr/lib64/girepository-1.0/" + gir_module + "-" + gir_versions[gir_module]):
                         gir_dependlist[pkg.name].add(module)
                         gir_foundlibs.add(module)
 
diff --git a/Namcap/rules/qmldepends.py b/Namcap/rules/qmldepends.py
index 17d86a1..6761491 100644
--- a/Namcap/rules/qmldepends.py
+++ b/Namcap/rules/qmldepends.py
@@ -7,7 +7,7 @@ import Namcap.package
 from Namcap.ruleclass import TarballRule
 from Namcap.util import is_elf
 
-qml_path = "usr/lib/qt6/qml/"
+qml_path = "usr/lib64/qt/qml/"
 
 
 def finddepends(modules):
@@ -60,7 +60,7 @@ class QmlDependencyRule(TarballRule):
             if entry.name.startswith(qml_path) and entry.name.endswith("/qmldir"):
                 included_modules += [entry.name.replace(qml_path, "").replace("/qmldir", "").replace("/", ".")]
                 continue
-            if not entry.name.endswith(".qml") and not any(entry.name.startswith(d) for d in ["usr/bin", "usr/lib"]):
+            if not entry.name.endswith(".qml") and not any(entry.name.startswith(d) for d in ["usr/bin", "usr/lib64"]):
                 continue
             f = tar.extractfile(entry)
             if not entry.name.endswith(".qml") and not is_elf(f):
diff --git a/Namcap/rules/rpath.py b/Namcap/rules/rpath.py
index d58907a..f5552d1 100644
--- a/Namcap/rules/rpath.py
+++ b/Namcap/rules/rpath.py
@@ -7,7 +7,7 @@ from Namcap.ruleclass import TarballRule
 from elftools.elf.elffile import ELFFile
 from elftools.elf.dynamic import DynamicSection
 
-allowed = ["/usr/lib", "/usr/lib32", "/lib", "$ORIGIN", "${ORIGIN}"]
+allowed = ["/usr/lib64", "/usr/lib", "/usr/lib32", "/lib64", "/lib", "$ORIGIN", "${ORIGIN}"]
 allowed_toplevels = [s + "/" for s in allowed]
 warn = ["/usr/local/lib"]
 
diff --git a/Namcap/rules/runpath.py b/Namcap/rules/runpath.py
index 9fe1e97..dd1918d 100644
--- a/Namcap/rules/runpath.py
+++ b/Namcap/rules/runpath.py
@@ -7,7 +7,7 @@ from Namcap.ruleclass import TarballRule
 from elftools.elf.elffile import ELFFile
 from elftools.elf.dynamic import DynamicSection
 
-allowed = ["/usr/lib", "/usr/lib32", "/lib", "$ORIGIN", "${ORIGIN}"]
+allowed = ["/usr/lib64", "/usr/lib", "/usr/lib32", "/lib64", "/lib", "$ORIGIN", "${ORIGIN}"]
 allowed_toplevels = [s + "/" for s in allowed]
 warn = ["/usr/local/lib"]
 
diff --git a/Namcap/rules/sodepends.py b/Namcap/rules/sodepends.py
index 5ea1c82..a5eec10 100644
--- a/Namcap/rules/sodepends.py
+++ b/Namcap/rules/sodepends.py
@@ -37,7 +37,7 @@ def scanlibs(fileobj, filename, custom_libs, liblist, libdepends, libprovides):
             bitsize = elffile.elfclass
             architecture = {32: "i686", 64: "x86-64"}[bitsize]
             # DT_SONAME means it provides a library
-            if tag.entry.d_tag == "DT_SONAME" and os.path.dirname(filename) in ["usr/lib", "usr/lib32"]:
+            if tag.entry.d_tag == "DT_SONAME" and os.path.dirname(filename) in ["usr/lib", "usr/lib64", "usr/lib32"]:
                 soname = re.sub(r"\.so.*", ".so", tag.soname)
                 soversion = re.sub(r"^.*\.so\.", "", tag.soname)
                 libprovides[soname + "=" + soversion + "-" + str(bitsize)].add(filename)
diff --git a/Namcap/tests/package/test_anyelf.py b/Namcap/tests/package/test_anyelf.py
index 62580ab..8c5fb98 100644
--- a/Namcap/tests/package/test_anyelf.py
+++ b/Namcap/tests/package/test_anyelf.py
@@ -62,7 +62,7 @@ build() {
   ar cru library.a main.o
 }
 package() {
-  install -m644 -D ${srcdir}/library.a ${pkgdir}/usr/lib/library.a
+  install -m644 -D ${srcdir}/library.a ${pkgdir}/usr/lib64/library.a
 }
 """
 
@@ -92,6 +92,6 @@ package() {
             f.write(self.pkgbuild_static)
         self.run_makepkg()
         pkg, r = self.run_rule_on_tarball(os.path.join(self.tmpdir, pkgfile), Namcap.rules.anyelf.package)
-        self.assertEqual(r.errors, [("elffile-in-any-package %s", "usr/lib/library.a")])
+        self.assertEqual(r.errors, [("elffile-in-any-package %s", "usr/lib64/library.a")])
         self.assertEqual(r.warnings, [])
         self.assertEqual(r.infos, [])
diff --git a/Namcap/tests/package/test_libtool.py b/Namcap/tests/package/test_libtool.py
index 2fe8719..69e359d 100644
--- a/Namcap/tests/package/test_libtool.py
+++ b/Namcap/tests/package/test_libtool.py
@@ -22,8 +22,8 @@ build() {
   true
 }
 package() {
-  mkdir -p "${pkgdir}/usr/lib"
-  touch "${pkgdir}/usr/lib/libsomething.la"
+  mkdir -p "${pkgdir}/usr/lib64"
+  touch "${pkgdir}/usr/lib64/libsomething.la"
 }
 """
 
@@ -34,5 +34,5 @@ package() {
         self.run_makepkg()
         pkg, r = self.run_rule_on_tarball(os.path.join(self.tmpdir, pkgfile), Namcap.rules.libtool.package)
         self.assertEqual(r.errors, [])
-        self.assertEqual(r.warnings, [("libtool-file-present %s", "usr/lib/libsomething.la")])
+        self.assertEqual(r.warnings, [("libtool-file-present %s", "usr/lib64/libsomething.la")])
         self.assertEqual(r.infos, [])
diff --git a/Namcap/tests/package/test_missingbackups.py b/Namcap/tests/package/test_missingbackups.py
index c204708..845aad4 100644
--- a/Namcap/tests/package/test_missingbackups.py
+++ b/Namcap/tests/package/test_missingbackups.py
@@ -23,8 +23,8 @@ build() {
   true
 }
 package() {
-  mkdir -p "${pkgdir}/usr/lib"
-  touch "${pkgdir}/usr/lib/libsomething"
+  mkdir -p "${pkgdir}/usr/lib64"
+  touch "${pkgdir}/usr/lib64/libsomething"
 }
 """
 
diff --git a/Namcap/tests/package/test_pathdepends.py b/Namcap/tests/package/test_pathdepends.py
index 9e44163..eda95a0 100644
--- a/Namcap/tests/package/test_pathdepends.py
+++ b/Namcap/tests/package/test_pathdepends.py
@@ -27,8 +27,8 @@ package() {
   touch "${pkgdir}/usr/share/glib-2.0/schemas/org.test.gschema.xml"
 
   # glib2-needed-for-gio-modules
-  mkdir -p "${pkgdir}/usr/lib/gio/modules"
-  touch "${pkgdir}/usr/lib/gio/modules/something.so"
+  mkdir -p "${pkgdir}/usr/lib64/gio/modules"
+  touch "${pkgdir}/usr/lib64/gio/modules/something.so"
 
   # hicolor-icon-theme-needed-for-hicolor-dir
   mkdir -p "${pkgdir}/usr/share/icons/hicolor/64x64/apps"
diff --git a/Namcap/tests/package/test_perllocal.py b/Namcap/tests/package/test_perllocal.py
index af1f507..8eb2acd 100644
--- a/Namcap/tests/package/test_perllocal.py
+++ b/Namcap/tests/package/test_perllocal.py
@@ -22,8 +22,8 @@ build() {
   true
 }
 package() {
-  mkdir -p "${pkgdir}/usr/lib/perl/5.12/site-local/libmine"
-  touch "${pkgdir}/usr/lib/perl/5.12/site-local/libmine/perllocal.pod"
+  mkdir -p "${pkgdir}/usr/lib64/perl/5.12/site-local/libmine"
+  touch "${pkgdir}/usr/lib64/perl/5.12/site-local/libmine/perllocal.pod"
 }
 """
 
@@ -33,6 +33,6 @@ package() {
             f.write(self.pkgbuild)
         self.run_makepkg()
         pkg, r = self.run_rule_on_tarball(os.path.join(self.tmpdir, pkgfile), Namcap.rules.perllocal.package)
-        self.assertEqual(r.errors, [("perllocal-pod-present %s", "usr/lib/perl/5.12/site-local/libmine/perllocal.pod")])
+        self.assertEqual(r.errors, [("perllocal-pod-present %s", "usr/lib64/perl/5.12/site-local/libmine/perllocal.pod")])
         self.assertEqual(r.warnings, [])
         self.assertEqual(r.infos, [])
diff --git a/Namcap/tests/package/test_permissions.py b/Namcap/tests/package/test_permissions.py
index ab07e78..bc2f9c4 100644
--- a/Namcap/tests/package/test_permissions.py
+++ b/Namcap/tests/package/test_permissions.py
@@ -34,8 +34,8 @@ package() {
 
   install -d -m 744 ${pkgdir}/usr/share/broken
 
-  install -d -m 755 ${pkgdir}/usr/lib/libstatic.a
-  ln -s libstatic.a ${pkgdir}/usr/lib/libstaticlink.a
+  install -d -m 755 ${pkgdir}/usr/lib64/libstatic.a
+  ln -s libstatic.a ${pkgdir}/usr/lib64/libstaticlink.a
 }
 """
 
@@ -54,7 +54,7 @@ package() {
                     ("file-not-world-readable %s", "usr/bin/secret"),
                     ("file-setugid %s", "usr/bin/unsafe"),
                     ("directory-not-world-executable %s", "usr/share/broken"),
-                    ("incorrect-library-permissions %s", "usr/lib/libstatic.a"),
+                    ("incorrect-library-permissions %s", "usr/lib64/libstatic.a"),
                 ]
             ),
         )
diff --git a/Namcap/tests/package/test_sodepends.py b/Namcap/tests/package/test_sodepends.py
index 92533a7..c703c24 100644
--- a/Namcap/tests/package/test_sodepends.py
+++ b/Namcap/tests/package/test_sodepends.py
@@ -44,7 +44,7 @@ package() {
     def test_sodepends(self):
         "Package with missing pacman dependency"
         pkgfile = "__namcap_test_sodepends-1.0-1-%(arch)s.pkg.tar" % {"arch": self.arch}
-        alpm_filename = os.path.join("usr/lib", get_soname("/usr/lib/libalpm.so"))
+        alpm_filename = os.path.join("usr/lib64", get_soname("/usr/lib64/libalpm.so"))
         with open(os.path.join(self.tmpdir, "PKGBUILD"), "w") as f:
             f.write(self.pkgbuild)
         self.run_makepkg()
diff --git a/Namcap/tests/package/test_unusedsodepends.py b/Namcap/tests/package/test_unusedsodepends.py
index c3a730f..3bc8f08 100644
--- a/Namcap/tests/package/test_unusedsodepends.py
+++ b/Namcap/tests/package/test_unusedsodepends.py
@@ -36,5 +36,5 @@ package() {
         self.run_makepkg()
         pkg, r = self.run_rule_on_tarball(os.path.join(self.tmpdir, pkgfile), Namcap.rules.unusedsodepends.package)
         self.assertEqual(r.errors, [])
-        self.assertEqual(r.warnings, [("unused-sodepend %s %s", ("/usr/lib/libm.so.6", "usr/bin/evilprogram"))])
+        self.assertEqual(r.warnings, [("unused-sodepend %s %s", ("/usr/lib64/libm.so.6", "usr/bin/evilprogram"))])
         self.assertEqual(r.infos, [])
diff --git a/Namcap/tests/pkgbuild/test_carch.py b/Namcap/tests/pkgbuild/test_carch.py
index 81be35e..27b1a38 100644
--- a/Namcap/tests/pkgbuild/test_carch.py
+++ b/Namcap/tests/pkgbuild/test_carch.py
@@ -41,7 +41,7 @@ package() {
   cd "${srcdir}"/${pkgname}-${pkgver}
   ./configure --prefix=/usr
   make DESTDIR="${pkgdir}" install
-  cp foobar /usr/lib/i686/pkg/
+  cp foobar /usr/lib64/i686/pkg/
 }
 """
 
diff --git a/namcap-tags b/namcap-tags
index 806a8e5..4eeff47 100644
--- a/namcap-tags
+++ b/namcap-tags
@@ -91,7 +91,7 @@ qml-module-no-package-associated %s %s :: Referenced QML module '%s' is an unins
 redundant-makedep %s :: Make dependency (%s) already included as dependency
 script-link-detected %s in %s :: Script link detected (%s) in file %s
 scrollkeeper-dir-exists %s :: Scrollkeeper directory exists (%s). Remember to not run scrollkeeper till post_{install,upgrade,remove}.
-site-ruby :: Found usr/lib/ruby/site_ruby in package, usr/lib/ruby/vendor_ruby should be used instead.
+site-ruby :: Found usr/lib64/ruby/site_ruby in package, usr/lib64/ruby/vendor_ruby should be used instead.
 specific-host-type-used %s :: Reference to %s should be changed to $CARCH
 specific-sourceforge-mirror :: Attempting to use specific sourceforge mirror, use downloads.sourceforge.net instead
 symlink-found %s points to %s :: Symlink (%s) found that points to %s