diff --git a/dependency_support/automake_substitution.bzl b/dependency_support/automake_substitution.bzl
index 29d01453..d0ffed5d 100644
--- a/dependency_support/automake_substitution.bzl
+++ b/dependency_support/automake_substitution.bzl
@@ -12,11 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Provides helper that replaces @VARIABLE_NAME@ occurences with values, as
+"""Provides helper that replaces @VARIABLE_NAME@ occurrences with values, as
 specified by a provided map."""
 
 def automake_substitution(name, src, out, substitutions = {}):
-    """Replaces @VARIABLE_NAME@ occurences with values.
+    """Replaces @VARIABLE_NAME@ occurrences with values.
 
     Note: The current implementation does not allow slashes in variable
     values."""
diff --git a/dependency_support/org_gnu_gnulib/config.in.h b/dependency_support/org_gnu_gnulib/config.in.h
index 6954bc32..2951be0b 100644
--- a/dependency_support/org_gnu_gnulib/config.in.h
+++ b/dependency_support/org_gnu_gnulib/config.in.h
@@ -834,7 +834,7 @@
 /* Define to 1 if you have the `snprintf' function. */
 #undef HAVE_SNPRINTF
 
-/* Define if the return value of the snprintf function is the number of of
+/* Define if the return value of the snprintf function is the number of
    bytes (excluding the terminating NUL) that would have been produced if the
    buffer had been large enough. */
 #undef HAVE_SNPRINTF_RETVAL_C99
diff --git a/dependency_support/org_pcre_ftp/config.h b/dependency_support/org_pcre_ftp/config.h
index 414b6612..66aa979b 100644
--- a/dependency_support/org_pcre_ftp/config.h
+++ b/dependency_support/org_pcre_ftp/config.h
@@ -275,7 +275,7 @@ sure both macros are undefined; an emulation function will then be used. */
    contain the relevant magic. If you do not define this macro, a suitable
     __declspec value is used for Windows systems; in other environments
    "extern" is used for a C compiler and "extern C" for a C++ compiler.
-   This macro apears at the start of every exported function that is part
+   This macro appears at the start of every exported function that is part
    of the external API. It does not appear on functions that are "external"
    in the C sense, but which are internal to the library. */
 /* #undef PCRE_EXP_DEFN */