diff --git a/packages/seacas/libraries/ioss/src/Ioss_StructuredBlock.h b/packages/seacas/libraries/ioss/src/Ioss_StructuredBlock.h
index ece3ea2b6a..283b3af21b 100644
--- a/packages/seacas/libraries/ioss/src/Ioss_StructuredBlock.h
+++ b/packages/seacas/libraries/ioss/src/Ioss_StructuredBlock.h
@@ -12,10 +12,11 @@
 #include "Ioss_NodeBlock.h"
 #include "Ioss_Property.h"
 #include "Ioss_ZoneConnectivity.h"
+#if !defined BUILT_IN_SIERRA
+#include <fmt/ostream.h>
+#endif
 #include <array>
 #include <cassert>
-#include <fmt/core.h>
-#include <fmt/ostream.h>
 #include <iosfwd>
 #include <stddef.h>
 #include <stdint.h>
@@ -370,6 +371,7 @@ namespace Ioss {
   };
 } // namespace Ioss
 
+#if !defined BUILT_IN_SIERRA
 #if FMT_VERSION >= 90000
 namespace fmt {
   template <> struct formatter<Ioss::BoundaryCondition> : ostream_formatter
@@ -377,3 +379,4 @@ namespace fmt {
   };
 } // namespace fmt
 #endif
+#endif
diff --git a/packages/seacas/libraries/ioss/src/Ioss_ZoneConnectivity.h b/packages/seacas/libraries/ioss/src/Ioss_ZoneConnectivity.h
index 9927e1b3d9..1df3ded943 100644
--- a/packages/seacas/libraries/ioss/src/Ioss_ZoneConnectivity.h
+++ b/packages/seacas/libraries/ioss/src/Ioss_ZoneConnectivity.h
@@ -10,8 +10,10 @@
 #include <array>
 #include <cassert>
 #include <cmath>
+#if !defined BUILT_IN_SIERRA
 #include <fmt/core.h>
 #include <fmt/ostream.h>
+#endif
 #include <iosfwd>
 #include <stdlib.h>
 #include <string>
@@ -154,6 +156,7 @@ namespace Ioss {
   IOSS_EXPORT std::ostream &operator<<(std::ostream &os, const ZoneConnectivity &zgc);
 } // namespace Ioss
 
+#if !defined BUILT_IN_SIERRA
 #if FMT_VERSION >= 90000
 namespace fmt {
   template <> struct formatter<Ioss::ZoneConnectivity> : ostream_formatter
@@ -161,3 +164,4 @@ namespace fmt {
   };
 } // namespace fmt
 #endif
+#endif
diff --git a/packages/seacas/libraries/ioss/src/heartbeat/Iohb_Layout.C b/packages/seacas/libraries/ioss/src/heartbeat/Iohb_Layout.C
index e08fd60a7f..39bcc59b9c 100644
--- a/packages/seacas/libraries/ioss/src/heartbeat/Iohb_Layout.C
+++ b/packages/seacas/libraries/ioss/src/heartbeat/Iohb_Layout.C
@@ -5,6 +5,9 @@
 // See packages/seacas/LICENSE for details
 
 #include "heartbeat/Iohb_Layout.h"
+#include <fmt/format.h>
+#include <fmt/ostream.h>
+#include <fmt/ranges.h>
 #include <string>
 
 namespace Iohb {
@@ -21,4 +24,92 @@ namespace Iohb {
     fmt::print(layout_, "{}{:>{}}", legendStarted ? separator_ : "", label, fieldWidth_);
     legendStarted = true;
   }
+
+  void Layout::output_common(const std::string &name)
+  {
+    if (count_++ > 0 && !separator_.empty()) {
+      fmt::print(layout_, "{}", separator_);
+    }
+
+    if (showLabels && !name.empty()) {
+      fmt::print(layout_, "{}=", name);
+    }
+  }
+
+  template void Layout::add(const std::string &name, const std::string &value);
+  template void Layout::add(const std::string &name, const int &value);
+  template void Layout::add(const std::string &name, const int64_t &value);
+  template void Layout::add(const std::string &name, const size_t &value);
+
+  // Ideally, this would be in the include file, but when building in Sierra, we
+  // need to keep all `fmt` includes out of the include file due to some TPLs
+  // having an embedded fmt which is a different version than used by IOSS.
+  template <typename T> void Layout::add(const std::string &name, const T &value)
+  {
+    output_common(name);
+    if (!showLabels && fieldWidth_ > 0) {
+      fmt::print(layout_, "{0:{1}}", value, fieldWidth_);
+    }
+    else {
+      fmt::print(layout_, "{}", value);
+    }
+  }
+
+  template <> void Layout::add(const std::string &name, const double &value)
+  {
+    output_common(name);
+    if (precision_ == -1) {
+      // Use lib::fmt full precision output -- as many digits as needed to fully represent the
+      // double
+      fmt::print(layout_, "{}", value);
+    }
+    else if (!showLabels && fieldWidth_ > 0) {
+      fmt::print(layout_, "{0:{1}.{2}e}", value, fieldWidth_, precision_);
+    }
+    else {
+      fmt::print(layout_, "{0:.{1}e}", value, precision_);
+    }
+  }
+
+  template void Layout::add(const std::string &name, const std::vector<int> &value);
+  template void Layout::add(const std::string &name, const std::vector<int64_t> &value);
+  template void Layout::add(const std::string &name, const std::vector<size_t> &value);
+
+  template <typename T> void Layout::add(const std::string &name, const std::vector<T> &value)
+  {
+    if (value.size() == 1) {
+      add(name, value[0]);
+    }
+    else {
+      output_common(name);
+      if (!showLabels && fieldWidth_ > 0) {
+        fmt::print(layout_, "{0:{1}}", fmt::join(value, separator_), fieldWidth_);
+      }
+      else {
+        fmt::print(layout_, "{}", fmt::join(value, separator_));
+      }
+    }
+  }
+
+  template <> void Layout::add(const std::string &name, const std::vector<double> &value)
+  {
+    if (value.size() == 1) {
+      add(name, value[0]);
+    }
+    else {
+      output_common(name);
+      if (precision_ == -1) {
+        // Use lib::fmt full precision output -- as many digits as needed to fully represent the
+        // double
+        fmt::print(layout_, "{}", fmt::join(value, separator_));
+      }
+      else if (!showLabels && fieldWidth_ > 0) {
+        fmt::print(layout_, "{0:{2}.{1}e}", fmt::join(value, separator_), precision_, fieldWidth_);
+      }
+      else {
+        fmt::print(layout_, "{0:.{1}e}", fmt::join(value, separator_), precision_);
+      }
+    }
+  }
+
 } // namespace Iohb
diff --git a/packages/seacas/libraries/ioss/src/heartbeat/Iohb_Layout.h b/packages/seacas/libraries/ioss/src/heartbeat/Iohb_Layout.h
index 34122957be..bc73c77b10 100644
--- a/packages/seacas/libraries/ioss/src/heartbeat/Iohb_Layout.h
+++ b/packages/seacas/libraries/ioss/src/heartbeat/Iohb_Layout.h
@@ -6,9 +6,6 @@
 
 #pragma once
 
-#include <fmt/format.h>
-#include <fmt/ostream.h>
-#include <fmt/ranges.h>
 #include <sstream>
 #include <string>
 #include <vector>
@@ -43,80 +40,4 @@ namespace Iohb {
     bool legendStarted{false};
   };
 
-  inline void Layout::output_common(const std::string &name)
-  {
-    if (count_++ > 0 && !separator_.empty()) {
-      fmt::print(layout_, "{}", separator_);
-    }
-
-    if (showLabels && !name.empty()) {
-      fmt::print(layout_, "{}=", name);
-    }
-  }
-
-  template <typename T> inline void Layout::add(const std::string &name, const T &value)
-  {
-    output_common(name);
-    if (!showLabels && fieldWidth_ > 0) {
-      fmt::print(layout_, "{0:{1}}", value, fieldWidth_);
-    }
-    else {
-      fmt::print(layout_, "{}", value);
-    }
-  }
-
-  template <> inline void Layout::add(const std::string &name, const double &value)
-  {
-    output_common(name);
-    if (precision_ == -1) {
-      // Use lib::fmt full precision output -- as many digits as needed to fully represent the
-      // double
-      fmt::print(layout_, "{}", value);
-    }
-    else if (!showLabels && fieldWidth_ > 0) {
-      fmt::print(layout_, "{0:{1}.{2}e}", value, fieldWidth_, precision_);
-    }
-    else {
-      fmt::print(layout_, "{0:.{1}e}", value, precision_);
-    }
-  }
-
-  template <typename T>
-  inline void Layout::add(const std::string &name, const std::vector<T> &value)
-  {
-    if (value.size() == 1) {
-      add(name, value[0]);
-    }
-    else {
-      output_common(name);
-      if (!showLabels && fieldWidth_ > 0) {
-        fmt::print(layout_, "{0:{1}}", fmt::join(value, separator_), fieldWidth_);
-      }
-      else {
-        fmt::print(layout_, "{}", fmt::join(value, separator_));
-      }
-    }
-  }
-
-  template <> inline void Layout::add(const std::string &name, const std::vector<double> &value)
-  {
-    if (value.size() == 1) {
-      add(name, value[0]);
-    }
-    else {
-      output_common(name);
-      if (precision_ == -1) {
-        // Use lib::fmt full precision output -- as many digits as needed to fully represent the
-        // double
-        fmt::print(layout_, "{}", fmt::join(value, separator_));
-      }
-      else if (!showLabels && fieldWidth_ > 0) {
-        fmt::print(layout_, "{0:{2}.{1}e}", fmt::join(value, separator_), precision_, fieldWidth_);
-      }
-      else {
-        fmt::print(layout_, "{0:.{1}e}", fmt::join(value, separator_), precision_);
-      }
-    }
-  }
-
 } // namespace Iohb