diff --git a/README.txt b/README.txt
index 48c3fd03b..33c10eee0 100644
--- a/README.txt
+++ b/README.txt
@@ -45,7 +45,7 @@ The installed toolchains have to match the one Qt was compiled with.
 You can build Valentina with
 
     cd $SOURCE_DIRECTORY
-    qmake -r
+    qmake Valentina.pro -r (or qmake-qt5, depending on your platform)
     make (or mingw32-make or nmake or jom, depending on your platform)
 
 Note:In order to build and use Valentina, the PATH environment variable 
@@ -61,6 +61,14 @@ You may also need to ensure that the locations of your compiler and
 other build tools are listed in the PATH variable. This will depend on 
 your choice of software development environment.
 
+Unix systems:
+Default prefix for command "make install" is /usr. For using another 
+prefix build with qmake command:
+
+qmake PREFIX=/usr/local Valentina.pro -r
+
+where /usr/local is a new prefix for installation.
+
 LICENSING
 ==========
 Valentina is free software: you can redistribute it and/or modify
diff --git a/src/libs/qmuparser/qmuparser.pro b/src/libs/qmuparser/qmuparser.pro
index 163ab5d40..f6fb679a9 100644
--- a/src/libs/qmuparser/qmuparser.pro
+++ b/src/libs/qmuparser/qmuparser.pro
@@ -67,9 +67,15 @@ unix:!macx{
         } else {
             PREFIX = $$DEFAULT_PREFIX/lib
         }
+        target.path = $$PREFIX
+    } else {
+        contains(QMAKE_HOST.arch, x86_64) {
+            target.path = $$PREFIX/lib64
+        } else {
+            target.path = $$PREFIX/lib
+        }
     }
 
-    target.path = $$PREFIX
     INSTALLS += target
 }
 
diff --git a/src/libs/vpropertyexplorer/vpropertyexplorer.pro b/src/libs/vpropertyexplorer/vpropertyexplorer.pro
index 9d9a2f27d..ffa6195a1 100644
--- a/src/libs/vpropertyexplorer/vpropertyexplorer.pro
+++ b/src/libs/vpropertyexplorer/vpropertyexplorer.pro
@@ -109,9 +109,15 @@ unix:!macx{
         } else {
             PREFIX = $$DEFAULT_PREFIX/lib
         }
+        target.path = $$PREFIX
+    } else {
+        contains(QMAKE_HOST.arch, x86_64) {
+            target.path = $$PREFIX/lib64
+        } else {
+            target.path = $$PREFIX/lib
+        }
     }
 
-    target.path = $$PREFIX
     INSTALLS += target
 }