diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ee8f6c8..0be31397 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 All notable changes to this project will be documented in this file.
 
 ## Unreleased - ???
+- Add `declare-headers` to jpm.
+- Fix error using unix pipes on BSDs.
 - Support .cc and .cxx extensions in `jpm` for C++ code.
 - Change networking code to not create as many HUP errors.
 - Add `net/shutdown` to close sockets in one direction without hang ups.
diff --git a/jpm b/jpm
index 3d1a505d..8bc62a65 100755
--- a/jpm
+++ b/jpm
@@ -452,6 +452,7 @@
   [opts]
   @[;(opt opts :cflags default-cflags)
     (string "-I" (dyn :headerpath JANET_HEADERPATH))
+    (string "-I" (dyn :modpath JANET_MODPATH))
     (string "-O" (opt opts :optimize 2))])
 
 (defn- getcppflags
@@ -459,6 +460,7 @@
   [opts]
   @[;(opt opts :cppflags default-cppflags)
     (string "-I" (dyn :headerpath JANET_HEADERPATH))
+    (string "-I" (dyn :modpath JANET_MODPATH))
     (string "-O" (opt opts :optimize 2))])
 
 (defn- entry-name
@@ -1053,6 +1055,16 @@ int main(int argc, const char **argv) {
     (each s sources
       (install-rule s path))))
 
+(defn declare-headers
+  "Declare headers for a library installation. Installed headers can be used by other native
+  libraries."
+  [&keys {:headers headers :prefix prefix}]
+  (def path (string (dyn :modpath JANET_MODPATH) (or prefix "")))
+  (if (bytes? headers)
+    (install-rule headers path)
+    (each h headers
+      (install-rule h path))))
+
 (defn declare-bin
   "Declare a generic file to be installed as an executable."
   [&keys {:main main}]
diff --git a/src/core/pp.c b/src/core/pp.c
index 252543e7..3846a660 100644
--- a/src/core/pp.c
+++ b/src/core/pp.c
@@ -617,7 +617,7 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
                     if (mincap >= INT32_MAX / 2) {
                         S->keysort_capacity = INT32_MAX;
                     } else {
-                        S->keysort_capacity = (int32_t) (mincap * 2);
+                        S->keysort_capacity = (int32_t)(mincap * 2);
                     }
                     S->keysort_buffer = janet_srealloc(S->keysort_buffer, sizeof(int32_t) * S->keysort_capacity);
                     if (NULL == S->keysort_buffer) {