Fix linux build.

src/ccutil/unicharmap.h

@@ -26,7 +26,7 @@ namespace tesseract {
 
 // A UNICHARMAP stores unique unichars. Each of them is associated with one
 // UNICHAR_ID.
-class UNICHARMAP {
+class TESS_API UNICHARMAP {
  public:
 
   // Create an empty UNICHARMAP

src/lstm/network.h

@@ -101,7 +101,7 @@ enum TrainingState {
 // Base class for network types. Not quite an abstract base class, but almost.
 // Most of the time no isolated Network exists, except prior to
 // deserialization.
-class Network {
+class TESS_API Network {
  public:
   Network();
   Network(NetworkType type, const std::string& name, int ni, int no);
@@ -277,7 +277,6 @@ class Network {
   void DisplayBackward(const NetworkIO& matrix);
 
   // Creates the window if needed, otherwise clears it.
-  TESS_API
   static void ClearWindow(bool tess_coords, const char* window_name,
                           int width, int height, ScrollView** window);
 

src/lstm/plumbing.h

@@ -96,9 +96,11 @@ class Plumbing : public Network {
     return stack_;
   }
   // Returns a set of strings representing the layer-ids of all layers below.
+  TESS_API
   void EnumerateLayers(const STRING* prefix,
                        GenericVector<STRING>* layers) const;
   // Returns a pointer to the network layer corresponding to the given id.
+  TESS_API
   Network* GetLayer(const char* id) const;
   // Returns the learning rate for a specific layer of the stack.
   float LayerLearningRate(const char* id) {
@@ -113,6 +115,7 @@ class Plumbing : public Network {
     *lr_ptr *= factor;
   }
   // Returns a pointer to the learning rate for the given layer id.
+  TESS_API
   float* LayerLearningRatePtr(const char* id);
 
   // Writes to the given file. Returns false in case of error.