4 files changed, 61 insertions, 5 deletions
diff --git a/configure.ac b/configure.ac
index 1dfa107..0b2ba97 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,6 +23,52 @@ dnl test instead.
 AC_CHECK_LIB([freeimage], [FreeImage_GetVersion],,
   [AC_MSG_ERROR([freeimage not found.])])
 
+LIBFREEIMAGE="libfreeimage"
+LIBFREEIMAGE_LIBDIR="no"
+LIBFREEIMAGE_PREFIX="no"
+
+AC_ARG_WITH([libfreeimage-prefix],
+  [AS_HELP_STRING([--with-libfreeimage-prefix=DIR], [search for FreeImage in DIR])],
+  [case "$withval" in
+    yes|no)
+      ;;
+    *)
+      LIBFREEIMAGE="$withval/lib/libfreeimage"
+      LIBFREEIMAGE_PREFIX="$withval"
+      LIBFREEIMAGE_LIBDIR="$withval/lib"
+      ;;
+   esac])
+
+dnl Library name suitable for `dynamic-link'.
+AC_MSG_CHECKING([for libfreeimage shared library name])
+AC_MSG_RESULT([$LIBFREEIMAGE])
+AC_SUBST([LIBFREEIMAGE])
+AC_SUBST([LIBFREEIMAGE_PREFIX])
+AC_SUBST([LIBFREEIMAGE_LIBDIR])
+
+LIBGSLCBLAS="libgslcblas"
+LIBGSLCBLAS_LIBDIR="no"
+LIBGSLCBLAS_PREFIX="no"
+
+AC_ARG_WITH([libgslcblas-prefix],
+  [AS_HELP_STRING([--with-libgslcblas-prefix=DIR], [search for GSL CBLAS in DIR])],
+  [case "$withval" in
+    yes|no)
+      ;;
+    *)
+      LIBGSLCBLAS="$withval/lib/libgslcblas"
+      LIBGSLCBLAS_PREFIX="$withval"
+      LIBGSLCBLAS_LIBDIR="$withval/lib"
+      ;;
+   esac])
+
+dnl Library name suitable for `dynamic-link'.
+AC_MSG_CHECKING([for libgslcblas shared library name])
+AC_MSG_RESULT([$LIBGSLCBLAS])
+AC_SUBST([LIBGSLCBLAS])
+AC_SUBST([LIBGSLCBLAS_PREFIX])
+AC_SUBST([LIBGSLCBLAS_LIBDIR])
+
 PKG_CHECK_MODULES([GSL], [gsl])
 
 AC_OUTPUT
diff --git a/sly/config.scm.in b/sly/config.scm.in
index b296492..012483e 100644
--- a/sly/config.scm.in
+++ b/sly/config.scm.in
@@ -22,7 +22,15 @@
 ;;; Code:
 
 (define-module (sly config)
-  #:export (%pkgdatadir))
+  #:export (%pkgdatadir
+            %libfreeimage
+            %libgslcblas))
 
 (define %pkgdatadir
   (or (getenv "GUILE_2D_PKGDATADIR") "@pkgdatadir@"))
+
+(define %libfreeimage
+  "@LIBFREEIMAGE@")
+
+(define %libgslcblas
+  "@LIBGSLCBLAS@")
diff --git a/sly/wrappers/freeimage.scm b/sly/wrappers/freeimage.scm
index 9680460..eb1ceeb 100644
--- a/sly/wrappers/freeimage.scm
+++ b/sly/wrappers/freeimage.scm
@@ -23,10 +23,11 @@
 
 (define-module (sly wrappers freeimage)
   #:use-module (system foreign)
-  #:use-module (sly wrappers util)
-  #:use-module (ice-9 format))
+  #:use-module (ice-9 format)
+  #:use-module (sly config)
+  #:use-module (sly wrappers util))
 
-(define libfreeimage (dynamic-link "libfreeimage"))
+(define libfreeimage (dynamic-link %libfreeimage))
 
 (define-syntax-rule (define-foreign name ret string-name args)
   (define name
diff --git a/sly/wrappers/gsl.scm b/sly/wrappers/gsl.scm
index f05f4ae..3146757 100644
--- a/sly/wrappers/gsl.scm
+++ b/sly/wrappers/gsl.scm
@@ -23,6 +23,7 @@
 
 (define-module (sly wrappers gsl)
   #:use-module (system foreign)
+  #:use-module (sly config)
   #:export (cblas-row-major
             cblas-no-trans
             cblas-sgemm
@@ -39,7 +40,7 @@
 ;;; GSL CBLAS Functions
 ;;;
 
-(define libgslcblas (dynamic-link "libgslcblas"))
+(define libgslcblas (dynamic-link %libgslcblas))
 
 (define-syntax-rule (define-foreign name ret string-name args)
   (define name